For instance, if you only get a very faint line, it might be hard to know whether or not that means your results are positive. I know how that feels firsthand. After more than two years of evading ...

The Food and Drug Administration said Tuesday that preliminary research shows some rapid antigen tests may be less sensitive at detecting the highly contagious omicron variant of the coronavirus. The ...

Jan 7 (Reuters) - Swabbing the nose with a rapid antigen test will not reliably detect the Omicron variant in the first few days of an infection, so manufacturers should seek U.S. approval to allow ...