Rehman S, Munir MK, Saeed S, Aftab A, Hanif A. Frequency of Re-infection and Severity of Symptoms among COVID-19 PCR Confirmed Patients. PJMR [Internet]. 2024 Feb. 6 [cited 2026 Sep. 10];62(4):142-7. Available from: https://pjmr.org.pk/index.php/pjmr/article/view/453