Soumya Swaminathan, WHO chief scientist, said "we don't have the information that's...

There aren't enough sequencing tests sent to labs to know if the symptoms are unique to...

Antibodies are one aspect of the immune response. It's not clear how well Pfizer's...

AstraZeneca and Johnson & Johnson's vaccines can cause "mutant" proteins to escape cells,...

One shot of Pfizer or Moderna vaccines appears at least 80% effective against symptomatic...

Pfizer recommends three weeks between shots. The study compared a three-week gap to a...

Sinovac's vaccine, Coronavac, was 98% effective at preventing death in health workers,...

A horizontal line across nails (called a Beau's line) can be a sign of other infections...