A global study has found strong evidence that a new form of the coronavirus has spread from Europe to the US. The new mutation makes the virus more likely to infect people but does not seem to make ...

SAN FRANCISCO (KGO) -- Preliminary data out of South Africa is giving the world insight into how strong omicron really is. The South African Medical Research Council just reported this variant may ...

DURHAM, N.C. -- Researchers at Duke University's School of Medicine helped discover a new strain of coronavirus. Dr. David Montefiori, a professor of surgery who also serves as Director of the ...

A ferocious surge of flu cases is linked in part to a variant that has not been dominant in the past few years — resulting in ...

New research suggests that Pfizer’s COVID-19 vaccine can protect against a mutation found in two highly contagious variants of the coronavirus that erupted in Britain and South Africa. Those variants ...

Have you ever wondered why you have to get a flu shot every year, but some vaccines are one-and-done? It all has to do with how and how fast viruses evolve - and that depends on mutation rates.

After a sharp uptick in flu cases in mid-December 2025, flu activity across the U.S. and Canada remains high.

The strain accounts for about 90% of flu cases.