Avian influenza A (H5N1) has mutated, so the symptoms of bird flu could change as more people get sick in 2025.

A variant of the virus caused disease in people in 1997, when there was a small but deadly outbreak in Hong Kong. Eighteen ...

Swine Flu' Strain Has Passed from Humans to Swine Nearly 400 Times Since 2009 July 27, 2023 — A new study of the strain of influenza A responsible for the 2009 H1N1 pandemic -- pdm09 -- shows ...

For influenza viruses, imperfection is a strength. They constantly mutate, producing new strains that challenge immune ...

A child ill with fever and conjunctivitis in San Francisco tested positive for bird flu but had no known source of ...

At the same time, recent CDC data shows that seasonal influenza A is rising across the U.S. — specifically the H1N1 (swine flu) and H3N2 strains. While it may just seem like a tiny change in ...

The nation's first human death due to the bird flu occurred this month, the latest development in a global outbreak that, ...

Humans and pigs share many biological traits that can amplify the spread and evolution of viruses — with swine flu (H1N1) ...

Dry weather in Pakistan has led to a surge in seasonal flu and respiratory virus cases. NIH reports 5 COVID-19, 147 swine flu, and 511 seasonal flu cases in December and January, urging citizens to ...