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. 

ariff khalid, jacinta santhanam, mohd nizam tzar, ang-lim chua, sharifah fadilah abdul wahid, wan rahiza wan mat, raha abd rahman, petrick periyasamy .  (2025).  evaluation of a pcr-based lateral flow device for detecting aspergillus and candida species from clinical specimens.  - heliyon.  1 - 8. 

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. 

ze chen lee, chu ee seow, petrick periyasamy .  (2024).  double trouble: an unusual case of klebsiella pneumoniae invasive syndrome with liver abscess, gallbladder empyema and infective endocarditis.  - bmc infectious diseases.  1 - 6. 

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. 

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. 

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. 

ariff khalid, jacinta santhanam, mohd nizam tzar, ang-lim chua, sharifah fadilah abdul wahid, wan rahiza wan mat, raha abd rahman, petrick periyasamy .  (2025).  evaluation of a pcr-based lateral flow device for detecting aspergillus and candida species from clinical specimens.  - heliyon.  1 - 8. 

ilham ismail, mahrunissa mahadi, cheong xiong khee, najma kori, petrick k. periyasamy, norlela sukor..  (2025).  fungal shadows: diagnostic and management challenges of adrenal histoplasmosis in an immunocompetent adult.  - journal of the asean federation of endocrine societies.  99 - 100. 

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

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.  . 

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. 

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. 

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

nurul syafiqah nabila abdul kadir, siti norlia othman, norzuriza mohd rais, hui-min neoh, meng ling moi, najma kori, petrick periyasamy and nor azila muhammad azami.  (2025).  association between viral factors and clinical manifestations observed in dengue patients in malaysia.  - postgraduate research conference 2025.  . 

nurul dayana zainuddin, siti norlia othman, norzuriza mohd rais, hui-min neoh, meng ling moi, najma kori, petrick periyasamy and nor azila muhammad azami.  (2025).  differences in titers of neutralizing antibody in primary and secondary dengue patients admitted to a teaching hospital in malaysia.  - postgraduate research conference 2025.  . 

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

u.a. zainulabid , x.k. cheong, n. kori, p. periyasamy, m.z. abdul muien, r. musily, i. mohamed rose, n. zaidan, n. ismail ,h.m. neoh , h.m. gan .  (2025).  rapid nanopore sequencing as a key diagnostic tool in adrenal histoplasmosis after a year of uncertainty.  - escmid global abstract book 2025.  2561 - 2562.