Vaccine effectiveness against COVID-19 infection dropped from 91% to 66% once the delta variant accounted for the majority of circulating virus, according to a study published Tuesday by the U.S. Centers for Disease Control and Prevention.
Subscribe to WCVB on YouTube now for more: [ Ссылка ]
Get more Boston news: [ Ссылка ]
Like us: [ Ссылка ]
Follow us: [ Ссылка ]
Instagram: [ Ссылка ]
![](https://s2.save4k.ru/pic/tKDt_HEgWIo/maxresdefault.jpg)