Breakthrough infection after COVID-19 vaccination: A threat for Nepal due to SARS-CoV-2 variants circulating in 2nd wave ravaging India. J Patan Acad Health Sci [Internet]. 2021 Aug. 31 [cited 2026 Jul. 9];8(2):38-4. Available from: https://nepjol.info/index.php/JPAHS/article/view/37287