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. 

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. 

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. 

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. 

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. 

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. 

Marsilla Mariaty Marzukie, Khairunisa Ahmad Affandi, Azyani Yahaya, Petrick Periyasamy.  (2019).  Disseminated histoplasmosis mimicking an acute appendicitis.  - Malaysian Journal of Pathology.  223-227. 

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. 

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. 

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. 

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. 

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. 

Periyasamy, P; Kadir, AA; Nyiu, CS.  (2011).  Cotrimoxazole resistant Burkholderia pseudomallei in neurological melioidosis.  - International Journal Of Infectious Diseases.  15(1):S49.