Avian influenza

Bird flu; H5N1; H5N2; H5N8; H7N9; Avian influenza A (HPAI) H5

Avian influenza A viruses cause the influenza (flu) infection in birds. These viruses occur in wild birds and can infect domestic poultry. The viruses that cause the disease in birds can change (mutate) so it can spread to other animals and humans.

As of May 2024, one type of bird flu (H5N1) has spread to dairy cows in the United States and has infected one person (a dairy worker).

Causes

Symptoms

Exams and Tests

Treatment

Outlook (Prognosis)

Possible Complications

When to Contact a Medical Professional

Prevention