10K views · 62 reactions | Avian influenza, commonly called “bird flu,” is a viral infection that spreads in birds, cows and other animals. It can sometimes spread to people. In humans, H5 subtypes of influenza A are the most common cause. It can cause mild to severe respiratory symptoms and pink eye. People who work with poultry, waterfowl and dairy cows are most at risk. | Cleveland Clinic | Facebook