SAN FRANCISCO -- There has been a lot of talk about testing for the coronavirus, but you may not entirely understand what the different tests are for. The coronavirus makes some people sick, some ...

A T-cell test developed by Adaptive Biotechnologies could become the first commercially available test of its kind, and it may be more effective at detecting past COVID-19 infections than antibody ...

Troubling headlines have been cropping up across Asia: Patients who were diagnosed with COVID-19 and seemingly recovered have been readmitted to the hospital after testing positive for the virus again ...

STATEN ISLAND, N.Y. — With the terrifying coronavirus (COVID-19) pandemic of 2020 behind us and the world now returned to normal, many people have moved away from vaccination or even testing for the ...

Statewide blood testing for COVID-19 has found that only 2% of Virginians had antibodies to the virus as of mid-August. The result has prompted the researchers to conclude that herd immunity in ...

Anyone with worsening symptoms should contact their doctor or Healthline. People who have a weakened immune system, high-risk ...

As governments the world over seek ways to jumpstart economic activity, one proposal is a so-called “immunity passport” that would allow certain people who test positive for COVID-19 antibodies to ...

Among patients going to hospitals and clinics, there is an undercurrent of worry: “Could I catch COVID by being here, among sick people?” But doctors encourage patients not to postpone needed care, ...

SAN FRANCISCO -- It's a story that has been making headlines across the United States: Did Californians develop herd immunity after possibly being exposed to novel coronavirus last year? On Thursday, ...