Boppana TK, Mittal S, Madan K, Mohan A, Hadda V, Guleria R. Tuberculosis endemicity and BCG vaccination: Protection against COVID-19. Monaldi Arch Chest Dis [Internet]. 2022 Jun. 24 [cited 2024 Nov. 22];93(1). Available from: https://www.monaldi-archives.org/macd/article/view/2281