两个新的病例帮助科学家证实了许多人怀疑的事实：即使成功接种疫苗，人们也可能感染SARS-CoV-2变种。研究结果表明，在疫苗接种后，可能还需要继续进行检测，以防止未来爆发疫情。

Study of 'breakthrough' cases suggests COVID testing may be here to stay

https://www.sciencedaily.com/releases/2021/04/210422123631.htm

1. Ezgi Hacisuleyman, Caryn Hale, Yuhki Saito, Nathalie E. Blachere, Marissa Bergh, Erin G. Conlon, Dennis J. Schaefer-Babajew, Justin DaSilva, Frauke Muecksch, Christian Gaebler, Richard Lifton, Michel C. Nussenzweig, Theodora Hatziioannou, Paul D. Bieniasz, Robert B. Darnell. Vaccine Breakthrough Infections with SARS-CoV-2 Variants. New England Journal of Medicine, 2021; DOI: 10.1056/NEJMoa2105000