Pig cells can be infected by both bird flu and human flu, making pigs a potential “mixing vessel” in which influenza viruses with pandemic potential could be brewed. Has this happened yet? Thankfully, ...

The strain that has caused most damage to poultry in recent years and the death of one person in the U.S. is the H5N1. But the H7N9 bird flu virus has proved to have a far higher death rate, killing ...