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New Avian Influenza Genotype Detected in US Dairy Cattle


In a significant development, the U.S. Department of Agriculture (USDA) has confirmed the detection of a new avian influenza genotype, H5N1 clade 2.3.4.4b, genotype D1.1, in dairy cattle. This marks the first time this genotype, previously found mostly in wild birds and poultry, has been identified in cattle.

The discovery was made through the USDA's National Milk Testing Strategy (NMTS) in Nevada, following an initial detection in milk samples. This genotype has been circulating among wild and migratory bird populations and has now spilled over into domestic livestock.

While the public health risk remains low, the Centers for Disease Control and Prevention (CDC) is closely monitoring the situation. The USDA and state authorities are conducting further investigations to understand the spread and implement measures to prevent further transmission.

Stay informed and stay safe!
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Location: United States

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