How do outbreaks of avian influenza spread within a country?
Droppings from infected wild birds can introduce the virus into both commercial and backyard poultry flocks. The risk that infection will be transmitted from wild birds to domestic poultry is greatest where domestic birds roam freely, share a water supply with wild birds, or use a water supply that might become contaminated by droppings from infected wild-bird carriers.
So called “wet?markets, where live birds are sold under crowded and sometimes unsanitary conditions, can be another source of spread.
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