Bird flu viruses may infect mammary glands more commonly than thought

Virus in cow milk was a big hint. Now tests show H5N1 infects the mammary glands of mice, too

Five dairy cows are shown being milked by a machine

Bird flu infections among cows in the United States can cause dips in milk production because the virus attacks cells in the animals’ mammary glands. A new study suggests other animals may get mammary infections, too.

Hispanolistic/Getty Images

The discovery of bird flu in dairy cow milk highlighted a previously overlooked target for the H5N1 virus: mammary glands.