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Bird flu outbreak: USDA issues nationwide raw milk testing
The USDA has mandated testing of raw milk for bird flu amid a multistate outbreak affecting 720 flocks in 15 states. California leads the way with more than 500 infected herds. This federal order includes sampling, surveillance, and contact tracing to control the virus and ensure dairy safety without significantly impacting milk prices.

Bird flu outbreak: USDA issues nationwide raw milk testing (Image credit: iStock)
The US Department of Agriculture (USDA) has announced a new federal order for the testing of raw, unpasteurized milk. bird fluThe decision has been taken in response to a multistate avian influenza outbreak affecting dairy cows, the first example of the virus infiltrating the country’s dairy supply.
way to control virus
Agriculture Secretary Tom Vilsack emphasized the importance of this testing initiative, saying, “This new milk testing strategy will build on the steps taken so far and provide states a roadmap to protect the health of their dairy herds.” Vilsack said the program is aimed at increasing the confidence of farmers and farm workers in the safety of their livestock and themselves, while also putting the country on a path to rapidly controlling and stopping the spread of the virus.
Bird flu in dairy cows: For the first time in 2023
The outbreak began in March, when the Centers for Disease Control and Prevention (CDC) first confirmed bird flu in dairy cows. Since then, the virus has affected about 720 herds in 15 states. California has been hardest hit, with more than 500 infected herds, followed by Colorado with 64 and Idaho with 35.
Human issues related to dairy cows
The outbreak of bird flu has also affected humans. As of December 6, the CDC reported 58 confirmed cases of avian influenza in seven states, with 32 cases in California alone. Of the California cases, 31 cases were linked to contact with dairy cows. Other states with reported cases include Michigan (2 cases), Colorado (1 case), and Texas (1 case). Additionally, 21 human cases resulted from contact with poultry, 11 of which were reported in Washington.
federal milk testing order
The new federal order orders dairy farms, bulk milk transporters, bulk milk transfer stations and processing facilities to provide raw milk samples upon request for H5N1 testing. Herd owners with confirmed infections must submit epidemiological information to facilitate contact tracing and disease surveillance. In addition, private laboratories and state veterinarians are required to report positive test results to the USDA.
Nationwide testing will begin in December
The first phase of the milk testing initiative will begin the week of December 16 in six states: California, Colorado, Michigan, Mississippi, Oregon and Pennsylvania. The testing process involves five monitoring phases, starting with intensive monitoring and transitioning to periodic sampling after all herds in a state are deemed unaffected.
Effect on milk prices
Despite the outbreak, Alan Bjerga, executive vice president of communications for the National Milk Producers Federation, said bird flu incidents in dairy cattle have not had a significant impact on milk production or prices. “The small number of infected herds compared to overall U.S. dairy production minimizes any disruption,” Bajraga said. USDA’s new testing strategy is not expected to change this dynamic.
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