A vian influenza

Bird flu (avian influenza) is a disease caused by an influenza virus that primarily affects birds. "Bird flu " is a phrase similar to "swine flu, " "dog flu, " "horse flu, " or "human flu " in that it refers to an illness caused by any of many different strains of influenza viruses that have adapted to a specific host. All known viruses that cause influenza in birds belong to the species influenza A virus. In the late 1990s, a new strain of bird flu arose that was remarkable for its ability to cause severe disease and death, especially in domesticated birds such as ducks, chickens, or turkeys. As a result, this strain was called highly pathogenic avian influenza. While its most highly pathogenic strain (H5N1) had been spreading throughout Asia since 2003, avian influenza reached Europe in 2005, and the Middle East, as well as Africa, the following year (Monke 2006).On January 22, 2012, China reported its second bird flu death in a month following other fatalities in Vietnam and Cambodia.