A longitudinal study finds that older adults who recovered from COVID-19 mount weakened non-spike-specific Th1 CD4+ T cell ...

Preliminary data suggests the omicron variant may be more likely to cause infections among vaccinated people. The CDC forecasts that the new wave of COVID cases could top previous peaks by January as ...

A genetic testing technique that helped identify the COVID-19 virus is increasingly being used to diagnose difficult ...

More than 99.99% of people fully vaccinated against Covid-19 have not had a breakthrough case resulting in hospitalization or death, according to the latest data from the US Centers for Disease ...

They are known as “vaccine breakthrough cases’’. And while they are rare, experts say they are to be expected because no vaccine is 100 per cent effective. But the emerging issue poses significant ...

Washington: I was supposed to meet up with my friend Hugo this weekend, but that won’t be happening anymore. Hugo, a 28-year old architect who lives in New York, has been diagnosed with the ...

The CDC forecasts that the new wave of COVID cases could top previous peaks by January as the demand for at-home test surges. AP Photo/Matt Rourke NEW YORK -- As Americans brace for the possibility of ...