page = covid-19 : npr
url = https://www.npr.org/tags/804916759/covid-19
A sign urges people to get tested for a COVID-19 variant in Blackburn, England. The U.K. is experiencing a surge in the delta variant, which was first identified in India. Oli Scarff/AFP via Getty Images hide caption
Oli Scarff/AFP via Getty Images
Coronavirus FAQ: I've Been Vaccinated. Do I Need To Worry About Variants?
June 25, 2021 • Here's what we know about the effectiveness of vaccines for variants of concerns, notably the delta variant, first identified in India and now responsible for more than 20% of new U.S. cases.