udder

“Cow udders have receptors in common with birds, and they also have receptors in common with humans, where these viruses bind,” Karan said.

“Their faces are approximately 5 inches away from the milk and the udders all day long,” she said.

He didn’t expect to find himself under an udder on Tuesday.

If the virus spreads primarily via milking equipment, vaccines may need to trigger immunity in the udder.

Microscopic analysis of tissue from sick cows showed the virus infects cells in the alveoli, the millions of tiny milk-producing sacs in udders.