After a recent COVID-19 exposure, Dr. Christina Astley tested positive on an at-home test—but just barely. The line signifying a positive result was so faint that Astley, an endocrinologist at Boston ...

As the COVID-19 pandemic enters its fourth year, a negative result on a little plastic at-home test feels a bit less comforting than it once did. Still, you dutifully swab your nostrils before dinner ...

At-home rapid COVID-19 tests can reveal more about viral load than a simple positive/negative result, according to experts. "By definition, the basic technology suggests that you somehow have to go ...

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A man holds a negative rapid antigen coronavirus test at a makeshift testing center run by the Magen David Adom emergency service, in east Jerusalem, Monday, Jan. 24, 2022. (AP Photo/Mahmoud Illean) ...