nor adzimah johdi , noraidatulakma abdullah , ying-xian goh, joanna ooi su min, nor azila muhammad azami , muhammad irfan abdul jalal , azmawati mohammed nawi, norfazilah ahmad , mohd rohaizat hassan, anita sulong, najma kori, petrick periyasamy, faisal hamid, norrafidah md sapuan, sheela bai pannir selvam, noriah hajib, norlaila mustafa, noor zetti zainol rashid, sharifah azura salleh, hamidah alias, mohd shahrir mohamed said, siti norlia othman, poh bee koon, faizal amri hamzah, shamsuriani md jamal, razman jarmin, hanita othman, khamsiah nawawi, hanafiah harunarashid, mohammad nizam mokhtar, wan rahiza wan mat, azwa shawani kamalul arifin, aisyatul najihah khuzaimi, nazihah abd jalal, norliza ismail, nurul ain mhd yusuf, andri dauni, wan ahmad faisal wan sallam, ahmad syafiq shafie, mohd arman kamaruddin, rahman jamal.  (2026).  risk factors for covid-19 symptom severity across clinical categories among hospitalised patients in kuala lumpur, malaysia: a prospective cohort study.  - bmj open.  1 - 13. 

muhamad riduan daud, petrick periyasamy, kok-yong chin, najma kori, ummu afeera zainulabid, sheng qian yew, nur ezzaty mohammad kazmin, xiong khee cheong.  (2026).  low bone mineral density in men living with hiv on tenofovir antiretroviral therapy: a cross-sectional exploratory study from a malaysian tertiary hospital.  - tropical medicine and infectious disease.  1 - 14. 

nik nuratiqah nik abeed, xk cheong, najma kori, petrick periyasamy, boon hau ng, andrea ban, nor safiqah sharil, ilham ismail, mahrunnisa mahadi.  (2025).  triple hits: concurrent pulmonary kaposi’s sarcoma, tuberculosis, and pneumocystis jirovecii pneumonia in a newly diagnosed retroviral patient.  - respirology.  253 - 253. 

chee lan lau, ramliza ramli, petrick periyasamy, toh leong tan, hui-min neoh, aliza mohamad yusof, zainina zainal abidin, noranati zulkifli chia, mohd syazwan mohd saaid, munirah abdul aziz, isa naina-mohamed.  (2025).  performance of direct-from-blood-culture disk diffusion antibiotic susceptibility testing and its impact on antibiotic adjustment in bloodstream infections at a malaysian tertiary center.  - microbiology spectrum.  1 - 19. 

jennifer sok tin ting, ken siong hou wong, petrick periyasamy, roszalina ramli.  (2025).  methicillin-resistant staphylococcus aureus (mrsa) infection of the temple region of the face: case report.  - medicine.  1 - 6. 

wan nabilatul huda wan ghazali, nur izati mustapa, petrick periyasamy, suresh kumar chidambaram, nor aziyah mat rahim, zetti zainol rashid.  (2025).  cytomegalovirus infections in hiv/aids patients: prevalence, disease-associated factors and ganciclovir resistance.  - malaysian journal of pathology.  415 - 429. 

siti norlia othman, siti nurazizah mat asripin, zetti zainol rashid, petrick periyasamy, najma kori.  (2025).  sars-cov-2 antibody responses in covid-19 confirmed cases in a university hospital.  - malaysian journal of pathology.  401 - 414. 

kon ken wong, noor zetti zainol rashid, umi kalsom ali, nur hazlin chong, shairah abdul razak, najma kori, petrick periyasamy, alfizah hanafiah.  (2024).  genome sequencing and phylogenetic analysis of sars-cov-2 isolated from patients with covid-19 in hospital canselor tuanku muhriz (hctm), malaysia.  - sains malaysiana.  1767 - 1776. 

putri sabrina mohamed yusoff, norsyahida arifin, petrick periyasamy, nor rafeah tumian, fuad ismail, raja zahratul azma raja sabudin, zulkarnain md idris, noor wanie hassan, emelia osman.  (2024).  a comparative analysis of blood and faecal-based laboratory methods in the diagnosis of extraintestinal microsporidia infection.  - malaysian journal of pathology.  299 - 306. 

zainina zainal abidin, zetti zainol rashid, umi kalsom ali, wong kon ken, petrick periyasamy, mohd noor mat isa.  (2024).  sars-cov-2 infection in hiv patients: clinical characteristics, outcomes and duration of positivity.  - malaysian journal of pathology.  492 - 492. 

nor adzimah johdi , noraidatulakma abdullah , ying-xian goh, joanna ooi su min, nor azila muhammad azami , muhammad irfan abdul jalal , azmawati mohammed nawi, norfazilah ahmad , mohd rohaizat hassan, anita sulong, najma kori, petrick periyasamy, faisal hamid, norrafidah md sapuan, sheela bai pannir selvam, noriah hajib, norlaila mustafa, noor zetti zainol rashid, sharifah azura salleh, hamidah alias, mohd shahrir mohamed said, siti norlia othman, poh bee koon, faizal amri hamzah, shamsuriani md jamal, razman jarmin, hanita othman, khamsiah nawawi, hanafiah harunarashid, mohammad nizam mokhtar, wan rahiza wan mat, azwa shawani kamalul arifin, aisyatul najihah khuzaimi, nazihah abd jalal, norliza ismail, nurul ain mhd yusuf, andri dauni, wan ahmad faisal wan sallam, ahmad syafiq shafie, mohd arman kamaruddin, rahman jamal.  (2026).  risk factors for covid-19 symptom severity across clinical categories among hospitalised patients in kuala lumpur, malaysia: a prospective cohort study.  - bmj open.  1 - 13. 

muhamad riduan daud, petrick periyasamy, kok-yong chin, najma kori, ummu afeera zainulabid, sheng qian yew, nur ezzaty mohammad kazmin, xiong khee cheong.  (2026).  low bone mineral density in men living with hiv on tenofovir antiretroviral therapy: a cross-sectional exploratory study from a malaysian tertiary hospital.  - tropical medicine and infectious disease.  1 - 14. 

chu keat lim, xiong khee cheong, juen kiem tan, ummu afeera zainulabid, hui jan tan ,najma kori, petrick ramesh periyasamy.  (2026).  hemichorea-hemiballismus as presentation of toxoplasma gondii encephalitis in an immunocompromised host.  - cureus.  1 - 7. 

wan nabilatul huda wan ghazali, nur izati mustapa, petrick periyasamy, suresh kumar chidambaram, nor aziyah mat rahim, zetti zainol rashid.  (2025).  cytomegalovirus infections in hiv/aids patients: prevalence, disease-associated factors and ganciclovir resistance.  - malaysian journal of pathology.  415 - 429. 

jennifer sok tin ting, ken siong hou wong, petrick periyasamy, roszalina ramli.  (2025).  methicillin-resistant staphylococcus aureus (mrsa) infection of the temple region of the face: case report.  - medicine.  1 - 6. 

sharmili vidyadaran, mohan arumugam.  (2025).  cytokine storm: inflammation can harm.  - .  1 - 12. 

muhamaad razis ismail, dr petrick @ ramesh k periyasamy.  (2025).  budak senang kena.  - my metro.  . 

putri sabrina mohamed yusoff , norsyahida arifin , nurul shazalina zainudin ,nurulhasanah othman , rahmah noordin , asmahani azira abdu sani , wan mohd aizat wan kamaruddin , petrick periyasamy , wong kon ken , emelia osman .  (2025).  pengenalpastian dan penghasilan penanda diagnostik protein enterocytozoon bieneusi (b7xj00) untuk mikosporidiosis tersebar.  - simposium parasitologi & perubatan tropika 2025.  . 

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. 

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

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 periyasamy, faiz ruzman, sharifa ezat wan puteh.  (2026).  malaysia better prepared for nipah virus, but early detection remains tough.  - the sun.  . 

putri sabrina mohamed yusoff , norsyahida arifin , nurul shazalina zainudin ,nurulhasanah othman , rahmah noordin , asmahani azira abdu sani , wan mohd aizat wan kamaruddin , petrick periyasamy , wong kon ken , emelia osman .  (2025).  pengenalpastian dan penghasilan penanda diagnostik protein enterocytozoon bieneusi (b7xj00) untuk mikosporidiosis tersebar.  - simposium parasitologi & perubatan tropika 2025.  . 

muhamaad razis ismail, dr petrick @ ramesh k periyasamy.  (2025).  budak senang kena.  - my metro.  . 

petrick periyasamy, kirtinee ramesh.  (2025).  leptospirosis not minor illness, public warned.  - the sun .  . 

darshini sivanesan, nur ezzaty mohammad kazmin, petrick periyasamy, ummu afeera zainulabid, xiong khee cheong.  (2025).  the great mimicker: osteoarticular sporotrichosis masquerading as tuberculosis.  - asia pacific congress of clinical microbiology and infection 2025 .  .