Differing strains of the coronavirus continue to appear around the world and a new COVID-19 variant, the so-called "Delta" variant, has health experts concerned. The variant, otherwise known as B.1617 ...

Here’s what the Centers for Disease Control and Prevention (CDC) says about the Delta variant, its symptoms, characteristics and other things to watch for: Viruses constantly change through mutation, ...

Add Yahoo as a preferred source to see more of our stories on Google. (NewsNation) — As the weather begins to change and respiratory illnesses become more common, a highly transmissible strain of ...

More children are getting infected with COVID-19 and as a result, more kids are ending up in the hospital, but health experts are still unclear on whether the Delta variant driving the resurgence of ...

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 ...

"As these viruses continue to evolve, public health officials watch carefully to see whether new strains will be more easily spread or cause more severe disease, and they are continuously testing to ...

As summer comes to an end, COVID-19 cases are on the rise again in California. While respiratory viruses usually peak in the winter, the novel coronavirus can also surge in the warmer months.

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 ...

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 ...

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 ...