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.

A ferocious surge in influenza cases is linked in part to a variant that has not been dominant in the past few years — resulting in a waning of natural immunity. As millions of bedridden people can ...

Chinese researchers have identified a key mutation in the Ebola virus that may explain why one of the deadliest outbreaks in recent history spread so widely and persisted for so long. Their findings ...

In simple terms: a mutation is a stable change in genetic sequence that can be copied when cells or viruses replicate. Most mutations have no detectable effect, some contribute to disease, and a small ...

We're keeping an eye on new influenza and SARS-CoV-2 viral variants. Here's what we know about those viruses—and your immune system's ability to fight back. According to the U.S. Centers for Disease ...

A new COVID-19 strain, informally dubbed the Cicada variant, has sparked global curiosity and concern. Scientifically linked to the evolving COVID-19 virus and its Omicron Variant lineage, BA.3.2 is ...

A key step in the origin of many pandemics occurs when an animal-borne virus infects humans and then evolves to spread more efficiently from person to person. That is why scientists and physicians ...

SAN ANTONIO — More than two dozen states have confirmed cases of a new COVID variant, with experts saying the mutation poses risks to people who were previously infected or vaccinated. And, it was ...

The World Health Organization and the Centers for Disease Control and Prevention have both designated beta as a “variant of ...

The SARS-CoV-2 genome is subject to constant mutations. Some of these mutations reduce the effectiveness of RNA-based ...

Flu season is in full swing, and health experts are sounding the alarm on a variant that could bring another severe season in the U.S. Influenza A (H3N2) viruses are the most frequently reported ...