Contact tracing revs up in some states as omicron reaches US
A chewing gum that could reduce SARS-CoV-2 transmission
3 December 2021Delta still dominates say experts urging third jab
4 December 2021Contact tracing revs up in some states as omicron reaches US
The arrival of the omicron variant of the coronavirus in the U.S. has health officials in some communities reviving contact tracing operations in an attempt to slow and better understand its spread as scientists study how contagious it is and whether it can thwart vaccines.
