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![Vials of testing fluid and packages of nose swabs are seen at a drive through COVID-19 testing site at Churchill Downs on January 10, 2022 in Louisville, Kentucky.](https://woub.org/wp-content/uploads/2022/02/omicron-ba2-getty-1237645273-493161e72067f9a57cf7ae7b0c0f838564551ece-e1645458053728-900x422.jpg)
A more contagious version of omicron spreads in the U.S., fueling worries
By: Rob Stein | NPR
Posted on:
WASHINGTON, D.C. (NPR) — As the omicron surge continues to decline in the U.S., infectious disease experts are keeping a close eye on an even more contagious version of the… Read More