Hamid, S. M., Siddiqui, M. I., Akhtar, S., Raef, Q. M., Khalid, M., Khan, F. and Hashmi, S. (2016) “EFFICACY OF FLU VACCINE AMONG HAJJ PILGRIMS”, Pakistan Journal of Chest Medicine, 21(3), pp. 96–9. Available at: https://pjcm.net/index.php/pjcm/article/view/367 (Accessed: 12March2026).