nurul syafiqah abdul kadir, siti norlia othma, norzuriza mohd rais, hui-min neoh, meng ling moi, najma kori, petrick periyasamy and nor azila muhammad azami.  (2024).  genomic surveillance of dengue virus in patients admitted to a teaching hospital in kuala lumpur, malaysia from 2022 to 2023.  - 7th asia dengue summit.  81. 

cheelan lau, petrick periyasamy, kiew bing pau, shue hong kong, farah waheeda tajurudin, sheah lin ghan, nur jannah azman, stephanie wai yee tan, muhammad nazrin ibrahim, xiong khee cheong, ummu afeera zainulabid, fara rahidah hussin, toh leong tan, hui-m.  (2024).  improved timelines in antibiotic optimization: impact of pharmacists in bacteraemia stewardship.  - 2nd pharmcare symposium.  28. 

cheong xiong khee, tan jk, lim cj, kori n, periyasamy p.  (2024).  extensive cerebral venous thrombosis following by covid-19 vaccine with concomitant covid-19 infection.  - medicine & health.  324-329. 

balakrishnan kg, abd manaf mr, hassan mr , musa ki, mohamad jamil ar, satariah ali uk, periyasamy p, jamal r, mohd nadzir ms.  (2024).  determinants of hospital length of stay in respiratory infections: insights from cheras, malaysia.  - medicine & health.  245-256. 

nurul dayana zainudin, siti norlia othman, norzuriza mohd rais, hui-min neoh, meng ling moi, najma kori, petrick periyasamy & nor azila muhammad azami.  (2024).  seroprevalence of neutralizing antibodies against denv-1 and denv-4 among patients admitted to a teaching hospital in kuala lumpur.  - 7th asia dengue summit 2024.  82. 

ummu afeera zainulabid, khairul azhar jaafar, azlida che aun, petrick periyasamy..  (2023).  unmasking a hidden culprit: a case of 'diphtheritic' colitis.  - the 19th asia pacific congress of clincal microbiology and infection.  232. 

ummu afeera zainulabid, muhammad afiq ab karim, najma kori, fara rahidah hussin, hazlina mahadzir, petrick periyasamy.  (2023).  chikungunya strikes the golden years -the unexpected visitor.  - the 19th asia pacific congress of clincal microbiology and infection.  273. 

nurul syafiqah nabilah abdul kadir, siti norlia othman, norzuriza mohd rais, hui-min neoh, meng ling moi, najma kori, petrick periyasamy, nor azila muhammad azami.  (2023).  optimization of annealing temperature for dengue virus serotyping using multiplex polymerase chain reaction (pcr) technique.  - medicine & health.  66-67. 

nurul syafiqah nabilah abdul kadir, siti norlia othman, norzuriza mohd rais, hui-min neoh, meng ling moi, najma kori, petrick periyasamy, nor azila muhammad azami.  (2023).  optimization of annealing temperature for dengue virus serotyping using multiplex polymerase chain reaction (pcr) technique.  - 9th regional conference on molecular medicine (rcmm) in conjunction with 5th national conference for cancer research (nccr).  1. 

mahrunissa mahadi, nor azila muhammad azami, noraidatulakma abdullah, siti norlia othman, najma kori, hui-min neoh, sharifah azura salleh, zetti zainol rashid, petrick periyasamy.  (2023).  emergence of dengue virus type 4 during covid-19 pandemics in patients admitted to a teaching hospital in malaysia.  - jurnal sains kesihatan malaysia.  115-125. 

nurul aisyah rapai kasini , ummu afeera zainulabid rashida safiuddin, wan husna barakah meor jamaludin, najma kori, petrick periyasamy.  (2023).  a case of dengue and covid-19 co-infection in a young man from malaysia.  - 33 eccmid.  P3165. 

ummu afeera zainulabid, najma kori, syed nabil2, benjie law, jia yee tan, jian kiat yuen, reena rahayu md zin, petrick periyasamy.  (2023).  a twist in the tale -actinomycotic maxillaryosteomyelitis in glottic cancer.  - the 19th asia pacific congress of clincal microbiology and infection.  182. 

sai banu selvarajah, lydia kamaruzaman, nani zalinda abdul razak, rozita mohd, ruslinda mustafar, petrick @ ramesh a/l k periyasamy, najma kori, ramliza ramli. shamsul azhar shah.  (2023).  evaluating the usage of intradialytic blood cultures in diagnosing catheter related blood stream infection.  - journal of clinical and translational nephrology.  7. 

fadzilatul ahya idris, leelavathi muthupalaniappen, petrick periyasamy.  (2023).  parental hesitancy and perception of the covid-19 vaccine for children below 5 years in cheras district, kuala lumpur.  - medical journal of malaysia.  177-183. 

hj tan, ch goh, cs khoo, cf ng, jk tan, wa wan zaidi, zk law, md zulkifli, sa md rani, wnn wan yahya, r remli, nm ibrahim, r hod, sam mukari, awm mohd mustapha, n kori, p periyasamy.  (2023).  neurological manifestations in sars-cov-2 infection: a singlecenter cross-sectional study in malaysia.  - neurology and clinical neuroscience.  17-26. 

petrick periyasamy, tan li fen, najma kori, ummu afeera zainulabid.  (2023).  rebound covid-19 after paxlovid in 2 related family members.  - international journal of infectious diseases.  S129. 

fara rahidah hussin , nor shuhaila shahril , ummu afeera zainulabid , najma kori , petrick periyasamy.  (2023).  pulmonary-urogenital tuberculosis: a delayed diagnosis.  - american society of tropical medicine and hygeine.  198-199. 

tan hui jan;petrick @ ramesh a/l k periyasamy;siti zaleha binti sahibulddin;rozita binti hod;wan asyraf bin wan zaidi;law zhe kang;nursyazwana binti zolkafli;khoo ching soong;ng chen fei.  (2023).  prevalence and factors associated with neurological abnormalities among covid-19 patients.  - .  . 

petrick @ ramesh a/l k periyasamy;lau chee lan;ramliza binti ramli;rozita binti hod;najma binti kori.  (2023).  early switching intravenous antibiotic to oral antibiotic in uncomplicated enterobacteriaceae bacteremia.  - .  . 

nurin zainal, aznida firzah abdul aziz, chai eng tan, rahmah kamaluddin, petrick periyasamy, noorul amilin binti sulaiman.  (2023).  pause©: the case for developing a premarital hiv testing aid for primary care settings in malaysia.  - malaysian journal of public health medicine.  190-200. 

petrick @ ramesh a/l k periyasamy;lau chee lan;rozita binti hod;najma binti kori.  (2023).  audit & feedback on carbapenem: impact of multidisciplinary antimicrobial stewardship team among medical patient in universiti kebangsaan malaysia medical centre .  - .  . 

hui jan tan, abdool alleem hj shahren, ching soong khoo, chen fei ng, wan asyraf wan zaidi, najma kori, petrick periyasamy, choon leng eu, alvin oliver payus, rozita hod.  (2023).  anxiety among hospitalized covid-19 patients: a case-control study from a tertiary teaching hospital in malaysia.  - frontiers in psychiatry.  1-13. 

kiran gb, afiqah syamimi m, kamarul im, mohd rizal am, mohd rohaizat h, azizul rahman mj, umi kalsom sa, petrick p, rahman j, mohd shahrul mn.  (2023).  prediction of influenza-like illness incidence in cheras, malaysia based on environmental data using the generalised additive model.  - medicine & health.  578-588. 

nor azura a, nur ayub ma, suriati sani, chu ming c, petrick p, wan asyraf wz, mohd rizal am, katijjahbe ma.  (2023).  the effect of enhanced respiratory care with early mobilization (e-recover) on cognitive and depression amongst patients with covid-19.  - 25th medical & health research week.  1. 

putri sabrina mohamed yusoff, norsyahida arifin, petrick periyasamy, nor rafeah tumian, fuad ismail, raja zahratul azma raja sabudin, rahmah noordin, emelia osman.  (2023).  antigenic reactivity of recombinant enterocytozoon bieneusi proteins against serum antibodies in disseminated microsporidiosis patients.  - 59th annual scientific conference of the malaysian society of parasitology & tropical medicine.  64. 

emelia osman, nur azma amin, thieeraporn phraseart ma noon, siti nuratiqah hanani lahat,mohamad syairazi rosli, shazia farhana sham, petrick ramesh periyasamy, nuraffini ghazali, noor wanie hassan, siti nor azreen abd manap, rahmah noordin.  (2023).  comparison between igg-elisa and igg4-based lateral flow (ssrapid) assays for the diagnosis of strongyloides infection in immunocompromised patients.  - 59th annual scientific conference of the malaysian society of parasitology & tropical medicine.  61. 

ummu afeera zainulabid , muhammad khidhir kamil, fatin farahani ramzah, lee chen dar, , mohamad azim md idris , lenny suryani safri, najma kori, petrick periyasamy.  (2023).  a vascular graft infection nightmare secondary to candida albicans.  - 33rd eccmid.  P3377. 

ummu afeera zainulabid, petrick periyasamy, cheong xiong khee, fara rahidah hussin, sunita sulaiman, siti rokiah yusof, nur ayuni ahmad faudzi, maliha farah nurhazirah yahya, adzim poh yuen wen, mohd hafiiz mohamad rizan, fazarina mohammed, sharifah azura.  (2023).  confluence of flames and fungus: navigating a complex superimposed fungal infection in the burn unit.  - apfcb laboratory medicine case contest.  01. 

ilham ismail, najma kori, chee lan lau, azmi mohd tamil, ramliza ramli, xiong khee cheong, petrick periyasamy.  (2023).  mortality rate and its risk factors for multidrug resistance acinetobacter baumannii bacteraemiain universiti kebangsaan malaysia medical centre (ukmmc).  - 3rd antimicrobial resistance symposium 2023.  39. 

x.k.cheong, p.periyasamy, n.kori,c.l.lau,t.l.tan,n.a.m.mustafa,r.ramli.  (2023).  novel emergency department specific antibiogram in malaysia.  - 3rd antimicrobial resistance symposium 2023.  60. 

nor azura a, nur ayub ma, suriati sani, chu ming c, petrick p, wan asyraf wz, mohd rizal am, katijjahbe ma.  (2023).  the effect of enhanced respiratory care with early mobilization (e-recover) on cognitive and depression amongst patients with covid-19.  - medicine & health.  39-40. 

nalini p, aaron i, petrick p, najma k, cheong xk, lau cl, rozita h, zetti z.  (2023).  clinical characteristics and outcomes of covid-19 patients during 2021 wave at hospital canselor tuanku muhriz.  - medicine & health.  5. 

ummu afeera zainulabid , nabil anaz anzani danapaul, chee lan lau , najma kori , yusuf zawir abd rahim, ramliza ramli , petrick periyasamy.  (2023).  revitalizing the blood culture volume.  - 33rd eccmid.  P3478. 

wahab, a.a, nurazizah, s.m.a, ding, c.h, muttaqillah, n.a.s, nordashima, a.s, kori, n, periyasamy, p.  (2023).  non-bacteremia liver abscess caused by burkholderia pseudomallei from a tertiary teaching hospital in malaysia: a case report and literature review.  - tropical biomedicine.  290-294. 

rafiq shajahan, ahmad zuhri shin abd halim , rozilah ishak , suria hayati md pauzi , nurismah md isa , wei hao kok , najma kori , ummu afeera zainulabid, petrick periyasam.  (2023).  hickam's dictum prevails: navigating the maze of dual pathology in hiv.  - clinical case competition.  11. 

kwan li li, ummu afeera zainulabid, fara rahida hussin, cheong xiong khee, petrick periyasamy..  (2023).  shattered hips, unbreakable spirit: navigating hiv therapy's roadblocks.  - clinical case competition.  10. 

tan kah shien, ummu afeera zainulabid1, fara rahidah hussin, cheong xiong khee, najma kori, petrick periyasamy..  (2023).  from negative to unmasked: cryptococcal meningitis iris strikes unexpectedly.  - clinical case competition.  9. 

u. salamah faisal, u.a. zainulabid, n. kori, p. periyasamy, t.m.n. khaithir.  (2023).  vibrio cholera o1 ogawa bacteremia with extraintestinal manifestation.  - international journal of infectious diseases.  S7. 

u.a. zainulabid, a. aslam, m. hussain, i. ibrahim, p. periyasamy, n. kamarudin, h.f. ahmad.  (2023).  whole genome sequence of sars-cov-2 from covid-19 acquired hemophilia patient.  - international journal of infectious diseases.  S14. 

u.a. zainulabid, s. wei, n. kamarudin, p. periyasamy, h.f. ahmad.  (2023).  tapping the pathogenic bacteria from hospital water tap system in malaysia using flongle nanopore.  - international journal of infectious diseases.  S6. 

p. periyasamy, p. shanmugam, n. kori, u.a. zainulabid.  (2023).  acute pyelonephritis with candidemia caused by fluconazole resistant candida albicans.  - international journal of infectious diseases.  S2. 

fadzilatul ahya idris, leelavathi muthupalaniappen, petrick periyasamy.  (2023).  parental hesitancy and perception of the covid-19 vaccine for children below five years in kuala lumpur.  - journal of health science and medical research.  95. 

saibanu selvajarah, lydia kamaruzaman, rozita mohd, ruslinda mustafar, petrick periyasamy, najma kori, nani zalinda abdul razak, ramliza ramli, shamsul azhar shah.  (2023).  the utility of intradialytic blood culture in diagnosing crbsi: a single centre study.  - journal of clinical and translational nephrology.  119. 

saibanu selvajarah, rozita mohd, ruslinda mustafar, petrick periyasamy, najma kori, nani zalinda abdul razak, ramliza ramli, shamsul azhar shah.  (2023).  prevalence and outcome of catheter related blood stream infections among hemodialysis patients in hctm.  - journal of clinical and translational nephrology.  115. 

ummu afeera zainulabid, fara rahidah hussin, najma kori, sreeambal ramankutty, muhammad nazri aziz, petrick periyasamy, muhamad yazli yuhana.  (2023).  when mycobacterium abscessus strikes: when bacteremia meets vertebral osteomyelitis.  - the 19th asia pacific congress of clincal microbiology and infection.  280. 

nurul izzati abdul aziz, ummu afeera zainulabid, farhan ibrahim, wong yin ping, fara rahidah hussin, najma kori, petrick periyasamy.  (2023).  surviving a deadly duo: a shocking case of double trouble in leptospirosis in leptospirosis.  - the 19th asia pacific congress of clincal microbiology and infection.  196. 

nur syazana mad tahir, aniza ismail, aznida firzah abdul aziz, syed mohamed aljunid, petrick periyasamy, hazlina mahadzir, fauzi md anshar, mohd faudzi abdullah, wong ping foo, ho bee kiau, mohd fairuz ali, rizah mazzuin razali.  (2022).  clinical pathway for influenza in the elderly: a comprehensive management protocol of malaysia.  - asia-pacific journal of health management.  1-14. 

nurul amirah mohamad farook, silvia argimón, muttaqillah najihan abdul samat, sharifah azura salleh, sunita sulaiman, toh leong tan, petrick periyasamy, chee lan lau, zalina ismail, nor azila muhammad azami, mia yang ang, hui-min neoh.  (2022).  diversity and dissemination of methicillin-resistant staphylococcus aureus (mrsa) genotypes in southeast asia.  - tropical medicine and infectious disease.  1-32. 

m sugenthiran, petrick periyasamy, ramliza ramli, najma kori ,lau chee lan, rosnah binti ismail.  (2022).  association between serotype of dengue virus and viremia level with clinical presentation among dengue patients adimitted to hospital canselor tuanku mukhriz (hctm): a pilot study.  - 5th international conference on tropical medicine and infectious diseases (ictmid).  1. 

muhammad hazwan nasarudin, najma kori,ramliza ramli, rozita hod,chee lan lau,petrick periyasamy.  (2022).  extended-spectrum beta-lactamase (esbl) bacteremia: looking into the risk factors of mortality from malaysian perspective.  - 5th international conference on tropical medicine and infectious diseases.  521. 

nazrul anuar nayan, choon jie yi, mohd zubir suboh, nur-fadhilah mazlan, petrick periyasamy, muhammad yusuf zawir abdul rahim and shamsul azhar shah.  (2022).  covid-19 prediction with machine learning technique from extracted features of photoplethysmogram morphology.  - frontiers in public health.  1-11. 

wan rahiza wan mat, cheah saw kian, aliza mohamad yusof, lau chee lan, michelle tan hwee peng, petrick periyasamy.  (2022).  pharmacotherapeutics in the critically ill covid-19 patients.  - malaysian journal of medicine and health sciences.  316-323. 

petrick periyasamy.  (2022).  experts: young adults with underlying conditions risk pneumonia.  - code blue.  1-3. 

najma kori, farida islahudin, muhammad yusuf zawir abd rahim, petrick periyasamy, noraida mohamed shah, ernieda md hatah, lau chee lan.  (2022).  corticosteroid effectiveness among hospitalised covid-19 patients in malaysia.  - journal of infection in developing countries.  1390-1397. 

ly sia loong, pauline siew mei lai, nurul adilla hayat jamaluddin, isa naina-mohamed, petrick periyasamy, chee lan lau, karin thursky, rodney james, sasheela ponnampalavanar.  (2022).  comparing the appropriateness of antimicrobial prescribing among medical patients in two tertiary hospitals in malaysia.  - journal of infection in developing countries.  1877-1886. 

sy hwan ang, petrick periyasamy, shamsul azhar shah, ramliza ramli, najma kori, chee lan lau.  (2022).  the risk factors for complications and survival outcomes of klebsiella pneumoniae bacteraemia in hospital canselor tuanku muhriz universiti kebangsaan malaysia.  - medical journal malaysia.  409-414. 

m sugenthiran , p periyasamy , n kori , cl lau.  (2022).  clinical significance of coagulase-negative staphylococci bacteremia its financial impact and treatment outcomes in ukmmc.  - 5th international conference on tropical medicine and infectious diseases (ictmid).  1. 

tuang wei xuan, palaniapan sivakumar, periyasamy petrick.  (2022).  first reported case of cladosporium liver abscess in immunocompromised host.  - medical mycology.  194. 

alex y. c. sim, ainal a. naffi, tang s. fai, najma kori, wan a. w. zaidi, petrick periyasamy, norshamsiah md din, mushawiahti mustapha, ayesha mohd zain.  (2022).  bilateral intermediate uveitis in a healthy teenager with the multisystem inflammatory syndrome in children secondary to covid-19 infection.  - journal of medical virology.  1269-1271. 

syarifah syahirah syed abas,noralisa abdul karim,petrick periyasamy,nurasyikin yusof,shamsul azhar shah,tan toh leong,saiful safuan md sani,hanita othman,sharifah azura salleh,nurul nadiah mohd zaidi,s fadilah abdul wahid,wan fariza wan jamaludin.  (2022).  correlation of dengue warning signs during febrile phase with rotational thromboelastometry, cortisol and feritin.  - international journal of environmental research and public health.  1-15. 

muhammad hazwan n, najma k, ramliza r, rozita h, chee ll, petrick p.  (2022).  risk factors for severe outcomes in extended-spectrum beta-lactamase (esbl) bacteremia: a single-center study.  - medicine & health.  56-69. 

petrick periyasamy tan li fen najma kori ummu afeera zainulabid.  (2022).  rebound covid-19 after paxlovid in 2 related family members.  - international congress on infectious diseases.  P08. 

petrick periyasamy prapatricca shanmugam najma kori ummu afeera zainulabid.  (2022).  acute pyelonephritis with candidemia caused by fluconazole resistant candida albicans.  - international congress on infectious diseases.  P52. 

ummu salamah faisal, ummu afeera zainulabid, najma kori, petrick periyasamy, tzar mohd khaithir.  (2022).  vibrio cholera o1 ogawa bacteremia with extrainstestinal manifestation.  - international congress on infectious diseases.  174. 

chee ll, petrick p, muhd nordin s, sarah anne r, lay yg, suet yc, kiew bp, shue hk, farah waheeda t, mei ky, sheah lg, nur jannah a, xin yc, poy kl, stephanie wyt, dexter vd, ramliza r, toh lt, aliza my, saw kc, wan rahiza wm, isa naina-mohamed.  (2022).  plethora of antibiotics usage and evaluation of carbapenem prescribing pattern in intensive care units: a single-center experience of malaysian academic hospital.  - antibiotics.  1-19. 

putri sabrina mohamed yusoff, norsyahida arifin, petrick periyasamy,nor rafeah tumian,fuad ismail,raja zahratul azma raja sabudin,rahmah noordin, emelia osman.  (2022).  production of enterocytozoon bieneusi recombinant protein and reactivity of its polyclonal antibodies toward encephalitozoon cuniculi.  - the 6th international conference on molecular diagnostic and biomarker discovery.  151. 

lai fong chan, eu choon leng, hajar mohamad salleh sahimi, nuur asyikin mohd syukor, nurul ain mohamad kamal, luke woon sy-cherng, liu chian yong, petrick @ ramesh k. periyasamy, najma kori, tan toh leong, clarence ko ching huat, nor hasnani zahari & azli.  (2022).  maintaining inpatient psychiatric services: malaysia.  - .  1. 

emelia osman, nur azma amin, thieeraporn phraseart ma noon, siti nuratiqah hanani lahat, mohamad syairazi rosli, shazia farhana sham, petrick ramesh periyasamy, nuraffini ghazali,siti nor azreen abd manap, and rahmah noordin.  (2022).  comparison of two serological assays in detecting strongyloides infection in immunocompromised patients.  - american journal of tropical medicine and hygiene.  636-639. 

boon hau ng, hsueh jing low, nik nuratiqah nik abeed, mohamed faisal abdul hamid, chun ian soo, petrick periyasamy, andrea ban yu-lin.  (2021).  understanding of coronavirus disease 2019 (covid-19) and the practice of preventive measures among doctors and nurses in a university teaching hospital- a cross-sectional study.  - medical journal of malaysia.  454-460. 

yusuf abu shamsi, xiong khee cheong, rozita mohd, petrick periyasamy, ruslinda mustafar.  (2021).  a case of lupus nephritis flare-up in severe covid-19 infection.  - medical journal of malaysia.  757-761. 

nurul adilla hayat jamaluddin, petrick periyasamy, chee lan lau, sasheela ponnampalavanar, pauline siew mei lai, ramliza ramli, toh leong tan, najma kori, mei kuen yin, nur jannah azman, rodney james, karin thursky and isa naina mohamed.  (2021).  point prevalence survey of antimicrobial use in a malaysian tertiary care university hospital.  - antibiotics.  1-13. 

wan fariza binti wan jamaludin;s fadilah binti s. abdul wahid;hanita binti othman;shamsul azhar bin shah;petrick @ ramesh a/l k periyasamy;tan toh leong;noralisa binti abdul karim.  (2021).  hemostatic parameters and biochemical markers to predict severe dengue infection in patients with “warning signsâ€� .  - .  . 

azmawati mohammed nawi, azimatun noor aizuddin, rozita hod, norfazilah ahmad, faiz daud, sharifah azura salleh, najma kori, petrick periyasamy, mohd rohaizat hassan, hanafiah harunarashid, kamaruzaman jusoff & mohd afiq arifin.  (2021).  managing covid-19 pandemic in teaching hospitals: an early preparedness setting (pengurusan pandemik covid-19 di hospital pengajar: suatu penetapan persediaan awal).  - sains malaysiana.  1165-1173. 

putri sabrina mohamed yusoff, norsyahida arifin, petrick periyasamy, nor rafeah tumian, fuad ismail, raja zahratul azma raja sabudin, rahmah noordin, noor wanie hassan, emelia osman.  (2021).  the diagnostic value of blood-based pcr for identification of extraintestinal microsporidiosis in immunocompromised patients.  - monash initiate: inaugural monash international health science and technology conference.  136. 

afifah aqilah abdul malik, petrick periyasamy, najma kori, asrul abdul wahab, chuan hun ding.  (2021).  a spuriously negative cryptococcal antigen assay result in disseminated cryptococcosis: the deception of the postzone phenomenon.  - annals of clinical & laboratory science.  430-433. 

shamira shahar, ruslinda mustafar, lydia kamaruzaman, petrick periyasamy, kiew bing pau, ramliza ramli.  (2021).  catheter-related bloodstream infections and catheter colonization among haemodialysis patients: prevalence, risk factors and outcomes.  - international journal of nephrology.  1-9. 

yusuf abu shamsi, wan rohaslizan wan daud, lydia kamaruzaman, ruslinda mustafar, rozita mohd, petrick periyasamy, abdul halim abdul gafor.  (2021).  the characteristics and outcome of covid-19 patients with acute kidney injury: a single center experience.  - 36th annual congress of malaysian society of nephrology.  138. 

wan rohaslizan wan daud, ruslinda mustafar, muhammad yusuf abu shamsi, lydia kamaruzaman, petrick periyasamy, junaida che ani.  (2021).  confronting the pandemic, reconfiguration nephrology services: narrative report form a teaching hospital- universiti kebangsaan malaysia.  - 36th annual congress of malaysian society of nephrology.  144. 

norfazilah ahmad, norzehan fatimah mohd ali, azmawati mohammed nawi, mohd rohaizat hassan, azimatun noor aizuddin, rozita hod, faiz daud, sharifah azura salleh, petrick periyasamy, abdul halim abdul gafor, najma kori.  (2021).  clinical characteristics of patients with coronavirus disease 2019 (covid-19) in a teaching hospital in malaysia.  - journal of infection in developing countries.  1059-1065. 

putri sabrina mohamed yusoff, norsyahida arifin, petrick periyasamy, nor rafeah tumian, fuad ismail, raja zahratul azma raja sabudin, rahmah noordin, noor wanie hassan, emelia osman.  (2021).  the diagnostic value of blood-based pcr for diagnosis of disseminated microsporidiosis in immunocompromised patients.  - 57th annual scientific conference of the malaysia society of parasitology and tropical medicine.  93. 

petrick periyasamy, ng boon hau, umi kalsom satariah ali, zetti zainol rashid, najma kori.  (2021).  aerosolized sars-cov-2 transmission risk: surgical or n95 masks?.  - infection control & hospital epidemiology.  1150-1152. 

ilyana mohd zuhudi, wan rahiza wan mat, lau chee lan, ramliza ramli, petrick periyasamy, raha abdul rahman.  (2021).  evaluation of antimicrobial stewardship program in the general intensive care unit of a teaching hospital.  - annual scientific congress 2021.  56. 

azlina ibrahim, isa naina mohamed, lau chee lan, ramliza ramli, najma kori, petrick periyasamy.  (2021).  an observational prospective study on the appropriateness of ceftriaxone use in medical wards of ppukm.  - international journal of infectious diseases (ijid).  104. 

petrick periyasamy, navaneedha lingam mahalingam, najma kori, andrea ban yu lin, ramliza ramli, isa naina mohamed, lau chee lan.  (2021).  time to clinical stability in hcap in a tertiary center hospital in kuala lumpur.  - international journal of infectious diseases.  106. 

ahmad izuddin mustaffa, petrick periyasamy, lau chee lan, ramliza ramli, najma kori,.  (2021).  the overly attached bacteria.  - international journal of infectious disease.  167-168. 

thieeraporn phraseart ma noon, mohamad syairazi rosli, shazia farhana sham, siti nuratiqah hanani lahat, petrick@ramesh periyasamy, rahmah noordin, nuraffini ghazali, siti noor azreen abdul manap, nur azma amin, emelia osman.  (2021).  comparison of two serological assays in detecting strongyloides stercoralis infection in immunocompromised patients.  - 13th muasrm medical undergraduates annual scientific research meeting.  26. 

d. muhamad, p. periyasamy, r. ramli, l. chee lan, r. abdul rahman.  (2021).  impact of infectious diseases specialists in intensive care unit on antimicrobial utilization and patient outcomes.  - international journal of infectious diseases.  113. 

ilyana mohd zuhudi, wan rahiza wan mat, lau chee lan, ramliza ramli, petrick periyasamy, raha abdul rahman.  (2021).  evaluation of antimicrobial stewardship program in the general intensive care unit of a teaching hospital.  - medicine & health.  32-33. 

aliff saifuddin mohd shukri, nor rafeah tumian, nurasyikin yusof, azlin ithnin, petrick periyasamy, najma kori, noorzilawati sahak.  (2021).  comparison of coagulation parameters between covid-19 patients with and without pneumonia in a single tertiary hospital in kuala lumpur, malaysia.  - 18th malaysian society of haematology annual scientific meeting.  1-7. 

wan asyraf wan zaidi, muhamad danial zulkifli, najma kori, petrick k. periyasamy, wan nur nafisah wan yahya.  (2021).  ischaemic stroke in covid-19 patients in hospital canselor tuanku muhriz, national university of malaysia medical centre.  - international journal of stroke.  159. 

juen kiem tan, dalleen leong, hemalatha munusamy, nor hazwani zenol ariffin, najma kori, rozita hod, petrick periyasamy.  (2021).  the prevalence and clinical significance of presymptomatic covid-19 patients: how we can be one step ahead in mitigating a deadly pandemic.  - bmc infectious diseases.  1-10. 

petrick periyasamy.  (2021).  mims doctor.  - burden of pneumococcal disease among risk groups, pneumococcal vaccination strategies and recommendations among adults: local and global perspectives.  1-3. 

neoh hui min;sheila nathan;a. rahman bin a. jamal;alfizah binti hanafiah;wong kon ken;petrick @ ramesh a/l k periyasamy;ramliza binti ramli;muttaqillah najihan bin abdul samat;tan toh leong;ang mia yang;sylvia chieng.  (2021).  transforming pathogen identification in an era of the 4th industrial revolution: development of a decision-making algorithm for rapid pathogen identification in the clinical microbiology laboratory .  - .  . 

norhayati mohd zainee, kalaivani chellappan, joseph vehi, petrick periyasamy, zuraidah che man.  (2021).  clinical data analysis of dengue fever severity identification.  - biomedical research and therapy.  4447-4455. 

norhayati mohd zainee, kalaivani chellappan, joseph vehi & petrick periyasamy.  (2021).  the vital sign and haematological profile of adult dengue fever: a retrospective study.  - aims medical science.  56-69. 

nor azila ma, nor azian am, azmawati mn, sharifah azura s, petrick p, najma k, mohd rohaizat h, norfazilah a, anita s, hanita o, tuti ningseh md, nurul syakima am, ezanee azlina, siti aishah, nurul syeefa', abdul rashid, abdul halim, hanafiah hr, rahman j.  (2021).  covid-19 in malaysia: exposure assessment and prevention practices among healthcare workers at a teaching hospital.  - journal of infection in developing countries.  1816-1824. 

nurnabila syafiqah muhamad rizal, hui-min neoh, ramliza ramli, petrick @ ramesh a/l k periyasamy, alfizah hanafiah ,muttaqillah najihan abdul samat, toh leong tan, kon ken wong, sheila nathan, sylvia chieng, seow hoon saw, bee yin khor.  (2021).  16s rrna gene next-generation sequencing (16sngs) for bacterial pathogen identification: pilot study in a malaysian teaching hospital.  - international journal of infectious diseases.  180-203. 

azlina ibrahim, isa naina mohamed, najma kori, chee lan lau, azmi mohd tamil, ramliza ramli, petrick periayasamy.  (2021).  evaluation of ceftriaxone use in the medical wards of universiti kebangsaan malaysia medical centre (ukmmc) and its outcome.  - clinical infectious diseases.  1-6. 

wan nabilatul huda wan ghazali, zetti zainol rashid, anita sulong, nur izati mustapa, petrick periyasamy, suresh kumar chidambaram.  (2021).  cytomegalovirus (cmv) infections in hiv/aids patients: study on infection prevalence, associated factors and drug-resistance testing.  - the 18th asia pacific congress of clinical microbiology and infection (apccmi), singapore 2021.  1. 

umi kalsom @ satariah ali, anita sulong, zetti zainol rashid, muttaqillah najihan abdul samat, wong kon ken, siti norlia othman, abdul hamydy abdul hamid, danori sardi, ainihayati noordin, petrick @ ramesh a/l k periasamy, najma kori, azmi baharudin.  (2020).  kriteria penerimaan / penolakan spesimen bagi ujian pengesanan rapid antigen covid-19 dan carta alir pemilihan pengujian covid-19.  - pengujian rapid ag covid-19, jabatan perkhidmatan makmal diagnostik, hospital canselor tuanku muhriz.  1-3. 

min h. cheah, eon t. gan, nur j. azman, najma kori, petrick periyasamy, siti-azdiah abdul-aziz.  (2020).  factors affecting modification of initial antiretroviral therapy regimen in hiv positive patients.  - journal of pharmaceutical policy and practice.  10. 

rayhan aghani e.amiseno, petrick periyasami, najma kori, ramliza ramli, isa naina mohamed, lau chee lan.  (2020).  the appropriateness in requesting for urine culture in ukmmc medical ward: a pre and post- educational intervention study.  - .  1-21. 

petrick periyasamy.  (2020).  all year round: malaysian expert cautions about the dangers of flu and what can be done.  - malaymail.  1. 

syahrul sazliyana shaharir, ruslinda mustafar, lydia kamaruzaman, andrea ban yu lin, petrick periyasamy.  (2020).  tuberculosis (tb) infection among the multiethnic systemic lupus erythematosus (sle) cohort in universiti kebangsaan malaysia medical centre.  - international journal of rheumatic diseases.  313. 

lydia kamaruzaman, fong voon ken, najma kori,petrick periyasamy,rozita mohd, ruslinda mustafar.  (2020).  infective endocarditis in renal transplant patient treated with partial oral antibiotic.  - 23rd annual scientific meeting of the malaysian society of transplantation.  91. 

uk ali, mn abdul samat, sn othman, zz rashid, kk wong, p periasamy, n kori, n rais, h yusof, s mohd puzi, a noordin, ah abdul hamid, a sulong, d zainuddin, nh ramli.  (2020).  performance of livzon covid-19 igg/igm rapid test device.  - .  1-4. 

victor ke lim, zamberi sekawi, yasmin a malik, ariza adnan, ilina isahak, zetti zainol rashid, ooi mong how, suresh kumar chidambaram, s fadilah, zakuan zaini deris..  (2020).  guidelines for adult immunisation.  - .  276. 

sn othman, zz rashid, uk ali, kk wong, mn abdul samat, p periasamy, n kori, n rais, h yusof, s mohd puzi, a noordin, ah abdul hamid, a sulong.  (2020).  lepu technology sars-cov-2 antibody test device.  - .  1-3. 

mn abdul samat, uk ali, sn othman, zz rashid, kk wong, p periasamy, n kori, n rais, h yusof, s mohd puzi, a noordin, ah abdul hamid, a sulong, ma ismail, na abu bakar.  (2020).  performance of panbio covid-19 igg/igm rapid test device.  - .  1-4. 

anita sulong, umi kalsom, zetti zainol rashid, muttaqillah najihan abdul samat, wong kon ken, siti norlia othman, abdul hamydy abdul hamid, danori sardi, ainihayati noordin, petrick @ ramesh a/l k periasamy, najma kori, hanita othman.  (2020).  carta alir ujian makmal polymerase chain reaction (pcr) covid-19.  - .  1-3. 

boon hau ng, nik nuratiqah nik abeed, andrea ban yu-lin, mohamed faisal abdul hamid, chun ian soo, najma kori, shahizon azura mohamed mukari, isa azzaki zainal, lydia kamaruzaman, muhammad yusuf abu shamsi, halim gafor, norlaila mustafa, wan nur nafisah w.  (2020).  lung computed tomography patterns of a cluster of asymptomatic young males with covid-19 admitted to a teaching hospital in kuala lumpur.  - medical journal of malaysia.  368-371. 

chien-chang leea, andrea lay hoon kwaa, anucha apisarnthanarak, jia-yih feng,eric howard gluck, akihiro ito, anis karuniawati, petrick periyasamy, busadee pratumvinit,jeetendra sharma, rontgene solante, subramanian swaminathan, niraj tyagi, dien minh v....  (2020).  procalcitonin (pct)-guided antibiotic stewardship in asia-pacific countries: adaptation based on an expert consensus meeting.  - clinical chemistry and laboratory medicine (cclm).  1983-1991. 

nurnabila syafiqah muhamad rizal, hui-min neoh, ramliza ramli, petrick @ ramesh a/l k periyasamy, alfizah hanafiah, muttaqillah najihan abdul samat, toh leong tan, kon ken wong, sheila nathan, sylvia chieng, seow hoon saw, bee yin khor.  (2020).  advantages and limitations of 16s rrna next-generation sequencing for pathogen identification in the diagnostic microbiology laboratory: perspectives from a middle-income country.  - diagnostics.  1-19. 

petrick @ ramesh a/l periyasamy.  (2020).  41 pelajar tahfiz sembuh : pengesanan, kuarantin, isolasi dan rawatan awal langkah tepat bantu proses penyembuhan.  - buletin bilik gerakan covid-19 hctm.  1-4. 

dr petrick @ ramesh periyasamy.  (2020).  bicara persada 59: covid 19, selamatkah kita?.  - .  1. 

sn othman, zz rashid, uk ali, kk wong, mn abdul samat, p periasamy, n kori, n rais, h yusof, s mohd puzi, a noordin, ah abdul hamid, a sulong, an zailani, mha mohd nasir.  (2020).  performance of reszon covid-19 rapid igg/igm test.  - .  1-4. 

petrick @ ramesh a/l k periyasamy.  (2020).  demam campak boleh bawa maut.  - mingguan malaysia.  34. 

petrick @ ramesh a/l k periyasamy.  (2020).  roche launches xofluza, a single-dose treatment for influenza in malaysia.  - malaysian business online.  -. 

petrick @ ramesh a/l k periyasamy.  (2020).  the star.  - any mask is still better than none.  -. 

ng boon hau, nik nuratiqah nik abeed, mohamed faisal abdul hamid, soo chun ian, low hsueh jing, najma kori, petrick periyasamy, norlaila mustafa, andrea ban yu-lin.  (2020).  a descriptive study of the psychological experience of health care workers in close contact with a person with covid-19.  - medical journal of malaysia.  485-489. 

nurul azmawati mohamed, nizam baharom, wan sw sulaiman, zetti z rashid, wong kon ken, umi k ali, siti n othman, muttaqillah n samat, najma kori, petrick periyasamy, nor a zakaria, agni n kumar sugurmar, cheong xiong khee, siti m saniman, ilina isahak.  (2020).  early viral clearance among covid-19 patients when gargling with povidone-iodine and essential oils: a clinical trial.  - international medical journal.  651-654. 

ng boon hau, andrea ban yu-lin, nik nuratiqah nik abeed, mohamed faisal abdul hamid, soo chun ian, najma kori, petrick periyasamy.  (2020).  covid-19 detected from targeted contact tracing, attempting to see the pattern in random happenings: early lessons in malaysia.  - medical journal of malaysia.  582-584. 

mohd rohaizat bin hassan, azmawati mohammed nawi, rozita hod, azimatun noor aizuddin, norfazilah ahmad, asrul bin abdul wahab, tzar mohd nizam bin khaithir, faiz daud, sharifah azura salleh, petrick @ ramesh, najma kori.  (2020).  bantuan penuh hctm: setinggi penghargaan rakyat malaysia.  - buletin bilik gerakan covid-19 hctm.  1-4. 

sn othman, zz rashid, uk ali, kk wong, mn abdul samat, p periasamy, n kori, n rais, h yusof, s mohd puzi, a noordin, ah abdul hamid, a sulong.  (2020).  performance of accobiotech covid-19 igg/igm rapid test device.  - .  1-3. 

nurul shazalina z, nurulhasanah o, rahmah n, asmahani azira as,wan mohd aizat wk, petrick p, emeliao..  (2020).  disseminated microsporidiosis: discovery of enterocytozoon bieneusi circulating proteins as potential diagnostic markers.  - medicine & health.  27. 

marsilla mariaty marzukie, khairunisa ahmad affandi, azyani yahaya, petrick periyasamy.  (2019).  disseminated histoplasmosis mimicking an acute appendicitis.  - malaysian journal of pathology.  223-227. 

petrick periyasamy.  (2019).  demam selepas masuk hutan mungkin jangkitan malaria.  - bh online.  1-3. 

emelia osman, nurul shazalina zainudin, rahmah noordin, nurul hasanah othman,asmahani azira abdu sani, wan mohd aizat wan kamaruddin, petrick ramesh periyasamy.  (2019).  identification of e. bieneusi circulating proteins from hiv/aids patients with disseminated microsporidiosis via shotgun proteomic approach.  - 55th annual scientific conference of the malaysian society of parasitology and tropical medicine (msptm).  84. 

hakim rahman, nailah huda, dr petrick periyasamy.  (2019).  hari aids sedunia.  - awani pagi.  . 

elengoe s, jamil a, goh sw, arumugam m, ismail r, periyasamy p.  (2019).  levetiracetam induced drug reaction with eosinophilia and systemic symptoms (dress).  - brunei international medical journal.  140-144. 

petrick periyasamy.  (2019).  hari aids sedunia.  - astro awani pagi.  . 

cl lau, j azman, n shaharuddin, c bacha lal, ma rosli, petrick periyasamy.  (2019).  observational study of iv to oral switch practice in malaysian teaching hospital.  - infection & chemotherapy.  173. 

najma kori, razman jarmin, petrick periyasamy, lau chee lan.  (2019).  new perspective of antimicrobial stewardship: changing surgeon's paradigm.  - antimicrobial resistance and infection control.  144-145. 

azlina ibrahim, isa naina mohamed, chee lan lau, ramliza ramli, najma kori, petrick periyasamy.  (2019).  appropriateness of ceftriaxone use in medical wards of ukmmc - how compliant are we?.  - antimicrobial resistance and infection control.  148. 

lim, m.y., abdul rahim, n., periyasamy, p., lau, c.l..  (2019).  assessment of polymyxin b associated nephrotoxicity in icu patients in a malaysian tertiary teaching hospital.  - malaysian journal of medicine and health sciences.  4. 

nurnabila syafiqah muhamad rizal, hui-min neoh, ramliza ramli, petrick @ ramesh a/l k periyasamy, alfizah hanafiah, muttaqillah najihan abdul samat, toh leong tan, kon ken wong, sheila nathan, sylvia chieng, seow hoon saw, bee yin khor.  (2019).  culture and biochemical testing versus 16s rrna gene sequencing for pathogen identification in the clinical microbiology laboratory: preliminary findings on cost comparison and breaking the bioinforma.  - infection & chemotherapy.  S94-S95. 

ammar younis kadhim timimi, rosmina jaafar, shamsul azhar shah, patrick periyasamy, and mohd alauddin mohd ali.  (2019).  innovative blood pressure assessor for tracking orthostatic intolerance in dengue.  - international journal of latest engineering research and applications (ijlera).  21-33. 

ding chuan hun;hamidah binti yusoff;petrick @ ramesh a/l k periyasamy;andrea ban yu-lin;muttaqillah najihan bin abdul samat;tang yee loong.  (2019).  prevalence of pneumocystis jirovecii pneumonia (pcp) in aids patients in ukm medical centre.  - .  1-5. 

chuan hun ding, hamidah yusoff, najihan abdul samat muttaqillah, yee loong tang, toh leong tan, petrick periyasamy, andrea yu-lin ban.  (2018).  the crucial role of molecular testing to facilitate the diagnosis of pneumocystis pneumonia during pregnancy.  - malaysian journal of pathology.  . 

syahrul sazliyana shaharir, narisa sulaiman sahari, zeena mohamed fuad, wan zul haikal wan zukiman, nurul hafizah mohd yusof, anita sulong, petrick periasamy.  (2018).  non-tuberculous mycobacterium bacteraemia in a pregnant systemic lupus erythematosus (sle) patient: a case review and pooled case analysis.  - clinical rheumatology.  837-847. 

petrick periyasamy.  (2018).  dengue: vaccine preventable diseases.  - malaysian journal of public health medicine.  . 

antimicrobial stewardship committee hctm ukm.  (2018).  hctm ppukm surgical prophylaxis guide 2018.  - .  73. 

nasheeda saeed, ching soong khoo, rabani remli, zhe kang law, petrick periyasamy, syazarina sharis osman and hui jan tan.  (2018).  first reported case of neuroleptospirosis complicated with anton's syndrome.  - frontiers in neurology.  1-5. 

cs ng, abdul wahid fs, tumian nr, wan jamaludin wf, yap e, petrick p, nurwahyuna r, noraidah m.  (2017).  back pain: road to burkitt`s "discovery".  - malaysian society of haematology 14th annual scientific meeting.  . 

petrick periyasamy.  (2017).  dengue : vaccine preventable diseases.  - third international conference on tropical medicine and infectious diseases.  . 

tser wan pang, adyani md-redzuan, mohd makmor-bakry, chee lan lau, zamri zuhdi, abdul halim abd rashid, nordiah awg jalil, ramliza ramli, raha abdul rahman, wan rahiza wan mat, razman jarmin, petrick@ ramesh k periyasamy,.  (2017).  compliance of antimicrobial prophylaxis practice for surgery in malaysian teaching hospital.  - australasian society for infectious diseases annual scientific meeting 2017.  . 

n.a. mohd fauzi, c.s. khoo, h.j. tan, a.m.m. shahizon, c.h. ding, m.n. tzar, m.p. suria hayati, k. nurul akmal, t. jegan, w.a. wan zaidi, p. petrick.  (2017).  the first case report of thoracic extradural mucormycosis in a diabetic patient.  - journal of the neurological sciences.  1004-1005. 

chia peck kee,petrick periyasamy,zhe kang law,norlinah mohamed ibrahim,wan nur nafisah wan yahya,hazlina mahadzir,shahrul azmin md rani,ramesh sahathevan,rabani remli,raymond azman ali,hui jan tan,syazarina sharis osman,shahizon azura mm,shamsul as.  (2017).  features and prognostic factors of tuberculous meningitis in a tertiary hospital in malaysia.  - journal of infectious diseases and epidemiology.  1-9. 

mohamed faisal abdul hamid, petrick periyasamy, andrea ban, roslina abdul manap.  (2017).  detection rate of pneumococcal pneumonia using the urine antigen kit binaxnow streptococcus pneumoniae test: a prospective cohort study in a tertiary hospital in malaysia.  - international medical journal malaysia.  29-36. 

ng choon seong, lau chee lan, chua xin yun, farah waheeda, sarah anee roberts ,nur jannah azman, lysia loong,pau kiew bing, kong shue hong,petrick periyasamy.  (2017).  carbapenem usage in medical wards an antibiotic stewardship feedback project.  - annual scientific meeting on emerging infectious threat.  . 

petrick periyasamy.  (2017).  malaysian consensus guidelines on antiretroviral therapy 2017.  - .  1-92. 

nurul shahirah solleh, azmi mohd tamil, petrick periyasamy.  (2017).  kajian tentang kualiti hidup, sokongan sosial dan kemahiran daya tindak bagi pesakit hiv di hospital canselor tuanku muhriz.  - 21st national public health colloquium.  . 

p.k. chia, p. periyasamy, z.k. law, s. sharis, s.a. mohamed mukari, s.a. shah, r. remli, n. yahya, h.j. tan, n. mohd ibrahim, r. azman ali.  (2016).  features of tuberculous meningitis in a tertiary hospital in malaysia.  - international congress for tropical medicine and malaria.  . 

ng cs, petrick p, abdul wahid fs, tumian nr, wan jamaluddin wf, yap e, nurwahyuna r, noraidah m.  (2016).  retroviral disease manifested early as spinal burkitt`s.  - national hiv treatment update 2016.  . 

pk chia, p periyasamy, zk law, s sharis, sa mohamed mukari, sa shah, r remli, n yahya, hj tan, n mohd ibrahim, r azman ali.  (2016).  survival analysis and clinical predictors of tuberculous meningitis in university kebangsaan malaysia medical center (ukmmc).  - 15th asian and oceanian congress of neurology.  . 

zainudin, n.s.,nasarudin, s.n.s.,periyasamy, p.,moktar, n.,noordin, r.,osman, e..  (2016).  diagnosis of disseminated microsporidiosis: detection of circulating enterocytozoon bieneusi dna in blood of hiv/aids patients.  - tropical biomedicine.  761-770. 

nurul shazalina z, petrick p, norhayati m, rahmah n, emelia o.  (2016).  disseminated microsporidiosis: detection of enterocytozoon bieneunsi circulating antigen from hiv patients via serum proteomic approach.  - 52nd annual scientific conference malaysian society of parasitology and tropical medicine.  . 

wan fariza wan jamaludin , petrick periyasamy , wan rahiza wan mat, s fadilah abdul wahid.  (2015).  dengue infection associated hemophagocytic syndrome: therapeutic interventions and outcome.  - xiith malaysia national haematology scientific meeting poster presentation list.  . 

law zk, henry lj, alias nf, kumar s, sahathevan r, htwe o, naicker as.  (2015).  do stroke patients load on both lower limbs differently from what they perceive?.  - cerebrovascular diseases.  58. 

ching soong khoo, wan yi leong, rosaida md said, suguna raman, pushpagandy ramanathan, petrick periyasamy.  (2015).  lymphedema in dengue fever -an unreported case.  - medico research chronicles.  687-692. 

choon seong ng, shahrul azmin, zhe kang law, ramesh sahathevan, wan nur nafisah wan yahya, rabani remli, petrick periyasamy, norlinah mohd ibrahim and hui jan tan.  (2015).  an unusual neurological complication from a garden-variety organism: post-melioidosis parkinsonism.  - the medical journal of australia.  333-334. 

petrick periyasamy.  (2015).  managing complicated mrsa ssti infections.  - infectious diseases & microbial genomics 2015.  . 

wan asyraf, mohd shahrir, petrick,mohamed faisal.  (2015).  a case report of chronic necrotising aspergillosis on tocilizumab therapy.  - medico research chronicles.  451-455. 

nurul shazalina z, petrick, p, norhayati m, rahmah n, emelia o.  (2015).  detection of microsporidia parasite in blood from hiv patients by pcr.  - 51st annual scientific conference of the malaysian soceity of parasitology and tropical medicine.  . 

datuk dr. christopher lee kwok chong, dato dr. faraizah, dato abdul karim, dr.petrick periyasamy, ravichandran jeganathan senior consultant, datin dr. rugayah bakri, dr. sabariah faizah jamaluddin, datin dr. sivasakthi velayuthapillai, dr. hari dass,.  (2015).  clinical practise guidlines: management of dengue infection in adults.  - clinical practise guidlines: management of dengue infection in adults.  1-43. 

mohamed faisal abdul hamid, petrick periyasamy, andrea ban yu-lin, roslina abdul manap.  (2015).  a prospective cohort study comparing between pneumococcal and non-pneumococcal community-acquired pneumonia (cap) and health-care associated pneumonia (hcap) in ukmmc.  - respirology.  127. 

ng c.s., isa h.m., periyasamy p., mohamad s., raja ali r.a..  (2015).  an ocular diploid fungus: a case of an overlook systemic mycosis.  - brunei international medical journal.  103-105. 

wan fariza wan jamaludin,petrick periyasamy, wan rahiza wan mat , s. fadilah abdul wahid.  (2015).  dengue infection associated hemophagocytic syndrome: therapeutic interventions and outcome.  - journal of clinical virology.  91-95. 

nanthini mageswaran, petrick periyasamy.  (2015).  knowledge and level of awareness of methicillin-resistant staphylococcus aureus (mrsa) among medical students.  - international future scientists conference 2015 ``meeting 21century demands: integrating arts & stem``.  . 

abdul halim abdul gafor, pau cheong ping, anis farahanum zainal abidin, muhammad zulhilmie saruddin, ng kah yan, siti qania`ah adam, ramliza ramli, anita sulong, and petrick periyasamy.  (2014).  antibiogram for haemodialysis catheter-related bloodstream infections.  - international journal of nephrology.  1-6. 

nur hasyimah othaman, petrick periyasamy.  (2014).  kurangkan antibiotik.  - isihat.  . 

chuan hun ding, mohd nizam tzar, md mostafizur rahman, najihan abdul samat muttaqillah, shazatul reza mohd redzuan, petrick periyasamy.  (2014).  paecilomyces lilacinus fungaemia in an aids patient: the importance of mycological diagnosis.  - pakistan journal of medical sciences.  30(4):914-6. 

nur hasyimah othaman, petrick periyasamy.  (2014).  kerjaya perubatan.  - isihat.  . 

cl lau, nj azman, sl ghan, fw tajuruddin, sh kong, kb pau, ls loong, sa robert, yk lai, mk yin, p periyasamy.  (2014).  impact of carbapenems stewardship in medical wards in a malaysian teaching hospital.  - 15th asia pacific congress of clinical microbiology and infection.  . 

petrick p, ding ch, tzar mn.  (2014).  prevalence of serum cryptococcal antigen (sca) positive rates at different cd4 ranges in art naive hiv patients at a tertiary center in kl.  - 3rd national aids conference (nac).  . 

ministry of health malaysia.  (2014).  consensus guidleines on antiretroviral therapy 2014.  - .  . 

z nurul shazalina, n siti nur su`aidah, p petrick, m norhayati, n rahmah, o emelia.  (2014).  first report on molecular detection of enterocytozoon bieneusi in blood from hiv/aids patients.  - jitmm2014 & fbpz8.  . 

petrick periyasamy.  (2013).  state of the art mrsa nosocomial pneumonia management : how can we improve treatment outcomes.  - malaysian thoracic society annual congress 2013.  . 

mohamed faisal, petrick periyasamy, andrea ban yu-lin, roslina abdul manap.  (2013).  detection rate of pneumococcal pneumonia using binaxnow streptococcus pneumoniae test, a prospective cohort study in a tertiary hospital in malaysia.  - respirology.  18(suppl 4) : 106. 

tzar mohd nizam khaithir, petrick periyasamy, hamidah yusoff.  (2013).  antifungal susceptibility profiles of candida blood isolates in ukmmc malaysia.  - 8th malaysia indonesia brunei medical sciences conference.  . 

chan gn, evelyn hjw, farah wt, izyan di, kong sh, lai yk, lau cl, leong sl, loong ls, michelle thp, pau kb, sarah ar, shairyzah ah, supadhara r, andrea byl, kong wy, petrick p, rizna ac.  (2013).  handbook of renal dose adjustment for common antimicrobials.  - .  17. 

mohamed faisal abdul hamid, petrick periyasamy, roslina abdul manap, andrea ban yu-lin, ramliza ramli, anita sulong, zalina ismail, tzar mohd nizam.  (2013).  aetiology and outcome of gram negative bacteria in adult community-acquired pneumonia and health-care associated pneumonia in university kebangsaan malaysia medical centre.  - 8th malaysia indonesia brunei medical sciences conference.  . 

mohamed faisal ah, petrick p, roslina am, andrea yl lan, ramliza r, anita s, zalina i, tzar nk, zaleha mi.  (2013).  detection rate of streptococcus pneumoniae using urinary antigen (binaxnow test) in community-acquired and health-care associated pneumonia in ukmmc.  - 9th international symposium on antimicrobial agents and resistance (isaar 2013).  . 

lau chee lan, nur jannah azman, gan sheah lin, kong shue hong, pau kiew bing, loong ly sia, sarah anne robert, farah waheeda tajurudin, lai yin key, yin mei kuen, petrick periyasamy.  (2013).  antimicrobial stewardship program in medical wards ukmmc.  - 8th malaysia indonesia brunei medical sciences conference.  . 

mohamed faisal ah, petrick p, roslina am, andrea yl ban, ramliza r, anita s, zalina i, tzar nk, zaleha mi.  (2013).  detection rate of pneumococcal pneumonia using urine antigen kit (binaxnow) in adult community-acquired and health care associated pneumonia in ukmmc.  - malaysian thoracic society annual congress 2013.  . 

petrick periyasamy.  (2013).  aids situation in malaysia.  - 8th malaysia indonesia brunei medical sciences conference.  . 

petrick periyasamy, leong chee loon, christopher lee.  (2013).  hyperlactatemia outcome in a cohort of patients with hiv on haart.  - 8th malaysia indonesia brunei medical sciences conference.  . 

petrick periyasamy.  (2013).  state-of-the-art mrsa nosocomial pneumonia management: how can we improve treatment outcomes.  - malaysian thoracic society annual congress 2013.  . 

abdul aziz marwan, chai soon ngiu, petrick periyasamy.  (2013).  an interesting finding in a patient with chronic diarrhoea.  - annals academy of medicine singapore.  42(2):97-98. 

pau cp, anis farahanum za, muhammad zulhilmie s, ng ky, siti qani`ah a, petrick p, ramliza r, anita s, abdul halim ag.  (2012).  antibiogram for haemodialysis catheter related sepsis.  - 4th medical undergraduates` annual scientific research meeting.  . 

q.nguyen, d. marriot and the malaysian candidaemia study (macas) group.  (2012).  candidaemia in malaysia : surprising results from a national study.  - 52nd icaac 2012.  . 

anti-infective guideline development group 2011/2012.  (2012).  ppukm anti-infective guideline 2012.  - .  *. 

p. periyasamy, d. marriott.  (2012).  a retrospective review of staphylococcal infections in st vincent`s hospital 2006-2007.  - 15th international congress on infection diseases.  . 

guidelines development group.  (2012).  management of tuberculosis.  - .  97. 

petrick periyasamy, narisa sulaiman sahari, rajalingham sakthiswary.  (2012).  thoracic spinal actinomycetoma: an under-recognised masquerader.  - the internet journal of internal medicine.  9(2). 

arif m shahar, chai soon ngiu, hasnur zaman hashim, hui jang tan, petrick periyasamy.  (2011).  no coma, but expressive dysphasia with cerebellar signs: an unique presentation of cerebral malaria.  - annals of academy of medicine singapore.  40(8):383-383. 

deborah je marriott, petrick periyasamy.  (2011).  anticonvulsant hypersensitivity syndrome secondary to lamotrigine mimicking a septic episode.  - annals of the academy of medicine, singapore.  40(9):422-423. 

periyasamy, p; kadir, aa; nyiu, cs.  (2011).  cotrimoxazole resistant burkholderia pseudomallei in neurological melioidosis.  - international journal of infectious diseases.  15(1):S49. 

yusairi fitri yusuf, petrick @ ramesh k periyasamy.  (2011).  misteri serangan adenovirus.  - isihat.  . 

azlina abu bakar, cs ngiu, ms mohamad said, petrick periyasamy.  (2011).  salmonella related mycotic aneurysm with psoas and paraortic abscess treated.  - annals academy of medicine singapore.  40(10):467-468. 

sakthiswary rajalingham, mohd shahrir mohd said, syahrul sazliyana shaharir, aini abaziz, petrick periyasamy, fauzi md anshar.  (2011).  dermatomyositis masquerading musculoskeletal tuberculosis.  - bmj case reports.  2011. 

petrick periyasamy, siva rao subramaniam, sakthiswary rajalingham.  (2011).  an increasingly notorious mimicker of testicular tumours;crossing borders.  - bmj case reports.  2011. 

dr petrick periasamy.  (2010).  current challenges in h1n1.  - 6th malaysia indonesia & brunei medical science conference.  . 

c s ngiu, m s mohamed said, p periyasamy, s f low.  (2010).  nocardiosis in a patient with rheumatoid athritis treated with rituximab and a summary of reported cases.  - bmj case reports.  2010:1-3. 

dr petrick k periyasamy.  (2009).  dengue fever vs chikungunya - the unresolved epidemic.  - the 1st annual health conference.  . 

n mustafa, p periyasamy, n kamaruddin.  (2009).  steven johnson syndrome in a patient with cushing`s disease.  - medical journal of malaysia.  64(3):238-239. 

p. petrick, n.c.t. kong, a.j. nordiah, c. izham, m.a. tamil.  (2007).  outcome of bacteraemia in patients admitted to the adult medical wards of the ukm hospital.  - medical journal of malaysia.  62(4):329-334. 

petrick periyasamy, norella ct kong, nordiah awang jalil, izham cheong.  (2007).  epidemiology of bacteraemia in patients admitted to the adult medical wards of the hospital universiti kebangsaan malaysia.  - malaysia, indonesia and brunei darussalam medical science conference.  . 

p. petrick, n.c.t. kong, a.j. nordiah, c. izham, m.a. tamil..  (2006).  outcome of bacteremia in patients admitted to the adult medical wards of the ukm hospital.  - 12th international congress on infectious diseases.  .