Avian flu

Avian flu or bird flu refers to one of several influenza type A viruses, those most likely to cause concern in humans are
 * Influenza type A H5N1 (since 1997)
 * Influenza type A H5N6 (since 2014)
 * Influenza type A H5N8 (since 2016)
 * Influenza type A H7N9 (since 2013)

While avian flu rarely infects humans, some variants have caused concern.

Learn more

 * Bird flu - NHS
 * Types of Influenza - CDC