Knowing how viruses change in the initial weeks of an infection can provide important information about their adaptability.

A 13-year-old girl in British Columbia who was hospitalized with bird flu for several weeks late last year harbored a mutated version of the virus, according to a report published this week in the New ...

Viruses evolve quickly mainly because of how they replicate and mutate. Unlike cells, viruses must invade a host cell and hijack its machinery to copy themselves, often producing huge numbers of new ...

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 ...

As the seasonal flu picks up, there are even more opportunities for the bird flu to acquire mutations as the different influenza viruses mix. A 13-year-old girl in British Columbia who was ...