Shahid, Rizwana, Muhammad Mujeeb Khan, Fatima Rauf, Rija Farrukh Chaudhary, Sheema Afzal, Muhammad Umar, and Shazia Zeb. “Polymerase Chain Reaction (PCR) Positivity of COVID-19 Reported in Teaching Hospitals of Rawalpindi Medical University Pakistan”. Infectious Diseases Journal of Pakistan 30, no. 4 (December 28, 2022): 95–98. Accessed December 19, 2025. https://ojs.idj.org.pk/index.php/Files/article/view/146.