SHAHID, R.; KHAN, M. M.; RAUF, F.; CHAUDHARY, R. F.; AFZAL, S.; UMAR, M.; ZEB, S. Polymerase Chain Reaction (PCR) Positivity of COVID-19 reported in Teaching Hospitals of Rawalpindi Medical University Pakistan. Infectious Diseases Journal of Pakistan, [S. l.], v. 30, n. 4, p. 95–98, 2022. Disponível em: https://ojs.idj.org.pk/index.php/Files/article/view/146. Acesso em: 19 dec. 2025.