"As these viruses continue to evolve, public health officials watch carefully to see whether new strains will be more easily ...

A new variant of the virus that causes COVID-19 is spreading in the U.S., raising concerns about a potential wave of ...

Doctors across multiple countries are flagging a painful new COVID-19 symptom tied to a fast-spreading variant: a sore throat so severe that patients compare it to swallowing razor blades. The symptom ...

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

Add Yahoo as a preferred source to see more of our stories on Google. Getty Images An alleged warning has spread online for years about a supposed "new COVID-Omicron XBB variant" — a new strain of the ...

Add Yahoo as a preferred source to see more of our stories on Google. While some liken it to the common cold, COVID-19 is still a lethal disease, and certain groups are still at a higher risk of a ...

The fast-spreading delta variant of the coronavirus has been gaining traction worldwide since it was first detected in India. It’s a version of the coronavirus that has been found in more than 80 ...

The timing of symptom onset depends on lots of factors, including the amount of virus to which someone was exposed, Hotez says. Their level of pre-existing immunity may also affect the likelihood or ...

Flu has overtaken covid in infections and hospitalizations during the winter respiratory virus season, and their virulence is becoming similar.