After exposure to COVID-19, most infections become detectable within 3–7 days. Testing too early can yield false negatives, ...

The XFG COVID-19 variant, aka "Stratus," is spreading rapidly in the U.S. as cases climb. Here's what to know about symptoms ...

The ride with COVID-19 has been a twisting one, and not all have been enjoyable. Perhaps the oddest, most unforgettable ...

COVID test positivity rates, which measure the percentage of positive tests out of all tests given, in the United States is ...

In decisional memos for the updated Moderna (Spikevax, mNexspike) and Novavax (Nuvaxovid) shots, the FDA's Center for ...

The U.S. Food and Drug Administration revoked the "Emergency Use Authorization" for COVID-19 vaccines. Here's what that means ...

COVID-19 variant XFG accounted for 0% of U.S. cases in May. By late-June, it became the third-most common strain.

Healthcare workers have been dealing with long COVID symptoms at a higher rate than the general public. The system’s response ...

COVID variant XFG, nicknamed Stratus, accounts for three-fourths of COVID cases in the U.S., according to the Centers for ...

More than a half a year into the battle against the novel coronavirus, here’s what we know now about the typical (and unusual) symptoms of Covid-19 — and the best ways to stay safe.