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American Focus > Blog > Health and Wellness > California, nation’s largest milk producer, will test 3 herds for H5N1 bird flu
Health and Wellness

California, nation’s largest milk producer, will test 3 herds for H5N1 bird flu

Last updated: August 29, 2024 8:13 pm
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California, nation’s largest milk producer, will test 3 herds for H5N1 bird flu
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The California Department of Food and Agriculture recently announced that they are investigating the possible introduction of the H5N1 bird flu in cattle at three dairy farms in the Central Valley. These potential cases would mark the first known instances of H5N1 in dairy cows in the state. Testing is currently underway at the state’s veterinary diagnostic lab, although the U.S. Department of Agriculture has not yet confirmed the outbreaks. If confirmed, California would become the 14th state to report an infection of H5N1 in dairy cows.

California is the largest milk producer in the nation, with approximately 1.7 million dairy cows. The majority of these cows reside in the San Joaquin Valley, where dairy farms are typically large operations that are spread out over significant distances. Farmers in the region have been taking extra precautions to prevent cross-contamination, such as thoroughly cleaning cow-toting trailers. Unlike in other states like Colorado and Michigan, where workers may interact with both dairy cows and poultry, workers in the San Joaquin Valley are dedicated to just one herd, reducing the risk of spreading infections.

Despite these preventative measures, experts have long feared that H5N1 would eventually make its way to California. Terry Lehenbauer, a bovine disease epidemiologist and professor emeritus at the University of California, Davis, stated that it seemed like only a matter of time before the virus reached the state. If confirmed, California would be the first new state to report H5N1 infections since Wyoming announced cases in June.

In response to the outbreak, the USDA has implemented an $824 million effort to enhance testing and surveillance for bird flu on dairy farms. This includes a voluntary pilot program for farms to proactively test samples from bulk milk tanks on a weekly basis. However, participation in these programs has been limited, with only 33 herds nationwide being regularly monitored as part of the USDA pilot program.

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Colorado stands out as the only state that has mandated all dairy farms to submit weekly milk samples from their bulk tanks for testing. This proactive approach has led to the discovery of additional infected herds and allowed officials to alert farmers early to prevent the spread of the virus. Scientists have found that H5N1 is detectable in bulk milk tank samples 14 to 16 days before clinical signs appear in cows, highlighting the importance of early testing.

Despite the success of Colorado’s program, other states have yet to follow suit. Iowa has implemented a more limited surveillance protocol, while states like Minnesota and Wisconsin are requiring testing of lactating cattle before they are shown at fairs. The decision to test remains largely up to individual farmers, as a coordinated effort for mandatory surveillance at the national level has not been established. Experts emphasize the importance of increased testing and surveillance to prevent the spread of H5N1 and protect the nation’s dairy industry. Despite the availability of veterinary diagnostic labs cleared to test for H5N1, the idea of government-mandated bulk milk tank testing at a national level has never materialized. According to a USDA spokesperson, the decision to mandate such testing is left to individual states, with no current plans for a nationwide initiative.

While Colorado’s order for bulk milk tank testing has been praised for its proactive approach to surveillance, experts like Poulsen believe that a coordinated effort across the country is crucial for both animal and human health. Poulsen expressed frustration over the underutilization of existing resources that could effectively respond to infectious outbreaks like H5N1.

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The lack of a national strategy for bulk milk tank testing is seen as a missed opportunity to enhance public health surveillance and protect farmers, farm workers, and communities from potential threats. Despite the capacity and readiness of the veterinary diagnostic network, the absence of a unified approach raises concerns about the country’s preparedness for infectious disease outbreaks.

Moving forward, stakeholders are encouraged to collaborate and implement a comprehensive strategy for bulk milk tank testing to better monitor and mitigate the spread of diseases like H5N1. By leveraging existing resources and expertise, the agricultural and public health sectors can work together to safeguard the well-being of both animals and humans.

TAGGED:BirdCaliforniaFluH5N1herdsLargestmilknationsProducerTest
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