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. 

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. 

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. 

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. 

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. 

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. 

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. 

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, 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. 

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. 

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. 

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. 

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. 

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. 

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

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. 

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

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

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.  - .  . 

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.  - .  . 

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. 

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. 

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.