Wild ducks are believed to be the carriers of all avian influenza type A viruses. The viruses are carried inside the bird's intestines and are brought into the environment through their poo (sorry bad language). Migratory birds infected with the virus spread the bird flu to any of the countries they visit.
Wild birds don’t usually show symptoms of bird flu, but the current H5N1 circulation strain has caused illness and death in some birds. The avian influenza virus can kill domesticated birds, such as chickens and turkeys more frequent.
Humans who have close contact with birds should be careful because they might have been at risk of infection with bird flu. For example a person may handle a sick bird, spoil their hands with chicken poo (sorry bad language), and forget to wash their hands before eating foods. They will then ingest the infected birds poo. This is a common way for a person to catch the virus.
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