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.  - .  . 

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. 

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 .  - .  . 

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. 

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, 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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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

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. 

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. 

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. 

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. 

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 signs” .  - .  . 

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. 

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. 

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 .  - .  . 

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. 

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. 

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. 

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. 

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. 

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. 

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.  -. 

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. 

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. 

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. 

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. 

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. 

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

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. 

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

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. 

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. 

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. 

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. 

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. 

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

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

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.  . 

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. 

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

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.  . 

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.  . 

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.  . 

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

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

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.  . 

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.  . 

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.  . 

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.  . 

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.  . 

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. 

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.  . 

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``.  . 

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.  . 

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

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

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

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.  - .  . 

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.  . 

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, 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.  . 

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).  . 

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.  . 

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.  . 

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.  . 

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

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

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

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.  . 

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

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

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

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.  .