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, ...

BALTIMORE — The delta variant symptoms are different from the original strand of COVID-19, a Johns Hopkins doctor said. Dr. Gabe Kelen, the director of emergency medicine at Johns Hopkins, said the ...

One thing we know for sure about SARS-CoV-2, the virus that causes COVID-19, is that it keeps changing. Since the start of the pandemic, we have seen several notable variants, including Alpha, Beta, ...

The ‘American Covid' strain is driving up cases across the UK.

Cases of Covid-19 have risen sharply across the UK this month, driven largely by a variant of the virus known as ‘XFG’.