How do birds get avian influenza?
Migratory waterfowl, such as wild ducks, are the natural reservoir for avian influenza and are the most resistant to clinical disease, meaning that they can carry and spread the virus without showing any signs of illness themselves. The feces of infected waterfowl are the likely source of some outbreaks of avian influenza in domestic birds. Domestic ducks may also carry the virus and infect other birds. The virus is shed in saliva, nasal secretions, and feces. Respiratory droplets and dust contaminated with the virus spread the disease to other birds. Footwear, supplies, vehicles, and equipment that are contaminated with bird droppings or feathers and dust from infected birds can also spread the disease from one place to another.
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