Last fall’s predicted surge of influenza cases, driven by the new “subclade K” mutation, is hitting U.S. emergency rooms as holiday get-togethers put people in close spaces where the flu virus can ...

California could see an early start to the annual flu season, as a combination of low vaccination rates and late mutations to the virus may leave the state particularly exposed to transmission, health ...

By Hugo Francisco de Souza Inside the rigorous, step-by-step process the CDC uses to create pandemic-ready flu vaccine ...

As the COVID-19 pandemic progresses, researchers say it is important to track how the coronavirus mutates because it could affect the efficacy of a vaccine. Like all living cells, viruses evolve their ...

California public health officials cautioned more children are testing positive for the flu this season. Here are flu ...