The announcement from the USDA comes after officials in Minnesota announced that goats on a farm where there had been an outbreak of bird flu among poultry were diagnosed with the virus. It's believed to be the first time bird flu was found in U.S. livestock.
USDA officials say the commercial milk supply is safe. Dairies are required to only allow milk from healthy animals to enter the food supply, and milk from sick animals is being diverted or destroyed.
Pasteurization also kills viruses and other bacteria, and the process is required for milk sold through interstate commerce.
Based on findings from Texas, officials think the cows got the virus from infected wild birds.
So far, the virus appears to be infecting about 10% of lactating dairy cows in the affected herds.
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