Cows might host both human and bird flus
Molecules that allow entry to both kinds of influenza viruses have been found in cattle
![A composite image showing a long rod-like H5N1 avian influenza virus, a black and white dairy cow facing the camera and rounded H2N3 human flu virus particles.](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2024/05/051324_ts_cow-flu-receptors.jpg?fit=876%2C580&ssl=1)
Cattle have entry portals that allow infection with both bird flu viruses (H5N1 avian influenza A, left) and human influenza viruses (H3N2 influenza A virus from a person, right).
NIAID; Peter Cade/Getty Images; NIAID