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.
Type A influenza virus is the most virulent form of influenza and the one that causes the most severe illness. This virus often originates in populations of wild birds, poultry, or swine (including pigs and hogs), so different strains are sometimes referred to as avian (bird) or swine flu.ype B influenza is not divided into subtypes, but the virus does mutate into different strains. Unlike Type A, Type B influenza is active throughout the year. Nevertheless, it generally causes a much milder form of the flu than Type A viruses.