The rapid spread of the delta variant is raising concerns among scientists that the coronavirus could mutate into more transmissible or deadlier strains. The fresh fears come as the U.S. vaccination ...

LONDON — A newly-discovered mutation of the delta variant is being investigated in the U.K. amid worries that it could make the virus even more transmissible and undermine Covid-19 vaccines further.

The new Omicron variant of coronavirus, with its many mutations and seemingly quick spread in South Africa, is worrying scientists and government officials. But doctors want to remind Americans that ...

Omicron spawn XBB.1.5, also known as "Kraken," now dominates the U.S. COVID variant scene, comprising an estimated 61% of cases, according to federal health data released Friday. But there's now a new ...

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, ...

Two of the seven defining mutations in the Delta variant spike protein arose through C→G transversions, a mutation type that is normally very rare in SARS-CoV-2 evolution. Nearly one-third of the ...

Upon first inspection, the mutations in the highly contagious delta COVID variant don't look that worrisome. For starters, delta has fewer genetic changes than earlier versions of the coronavirus.