Enlarge / A cow grazes in a field at a dairy farm on April 26, 2024, in Petaluma, California.Getty | Justin Sullivan
The outbreak of H5N1 bird flu in US dairy cows has now spread to three herds in California, the largest milk-producing state in the country with around 1.7 million dairy cows, federal and state health officials have confirmed.
Fourteen states and 197 herds have now been affected by the unprecedented outbreak in dairy cows, which was first confirmed by federal health officials on March 25.
In a statement, the secretary of the California Department of Food and Agriculture, Karen
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