Scientists are still trying to understand exactly how a virulent bird flu is spreading through farms in the United States, but one pattern is clear: poultry and cows risk exposure to sick wild birds ...
Knowing where, when and for how long mallard ducks—natural carriers of avian influenza—stop and rest as they migrate can help predict the probability that they will spread bird flu to backyard poultry ...
Knowing where, when and for how long mallard ducks -- natural carriers of avian influenza -- stop and rest as they migrate can help predict the probability that they will spread bird flu to backyard ...
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