Shrestha, R., R. . Shrestha, R. B. Khadka, and R. Gyawali. “Primary Immune Response Provides Protective Efficacy Against SARS-CoV-2 Reinfection”. Journal of Nepal Medical Association, vol. 59, no. 239, July 2021, pp. 727-9, doi:10.31729/jnma.5538.