Bird flu makes mallards thin, researchers find

WASHINGTON -- Avian flu viruses make mallard ducks thinner than other ducks, a finding that implies they do not spread the germs over long distances, researchers reported on Tuesday.

Their tests of thousands of ducks migrating through Sweden showed the viruses do affect the birds, contrary to conventional wisdom that the pathogens have no effect on them.

 

 

 

 

 

 

 

 

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