What documents do I need to travel outside the United States? In general, you will need to present a passport from your country of citizenship or your refugee travel document to travel to a foreign country. In addition, the foreign country may have additional entry/exit requirements (such as a visa).
However, avian influenza A viruses are very contagious among birds and some of these viruses can sicken and even kill certain domesticated bird species including chickens, ducks, and turkeys. Infected birds can shed avian influenza A viruses in their saliva, nasal secretions, and feces.
Bird Flu Causes. Bird flu is caused by a type of influenza A virus. There are many types of influenza viruses, and most prefer to live in a limited number of animal hosts. Thus, swine flu primarily infects swine, and bird flu primarily infects birds. The seasonal human influenza virus is best adapted to humans.