Numrah Shakeel Malik, Muhammad Umair, Farah Qasim, Ayesha Azam, Muhammad Muddassar, and Rimsha Qasim. 2023. “Does the COVID Vaccine Really Help? A Cross-Sectional Study to Assess the Positivity Rate Among Health Care Workers and Staff Members at Tertiary Care Hospitals”. Pakistan Journal of Chest Medicine 29 (3):329-36. https://doi.org/10.1996/pjcm.v29i3.829.