Avian flu strains tend to only affect birds, but the current outbreak has spread to cattle and – in rare cases – people. The ...

Immunity Against Seasonal H1N1 Flu Reduces Bird Flu Severity in Ferrets, Study Suggests Feb. 26, 2025 — Pre-existing immunity against seasonal H1N1 flu might help explain why most reported human ...

Bird flu, or avian influenza, is a viral infection spread from bird to bird. The most common kind is the H5N1 strain. While swine flu isn't as scary as it seemed a few years ago, it's still ...

Influenza B has never caused a pandemic. Both swine and avian influenza are strains of influenza A. Just as swine flu strains tend to infect pigs, avian flu strains tend to infect birds.