New H5N1 Flu Genotype Hits U.S. Dairy Farms

USDA Reports Emerging Genotype D1.1 in Nevada, Raising Concerns Over Viral Spread and Industry Impact

A concerning development has emerged from the U.S. Department of Agriculture (USDA) as its Animal and Plant Health Inspection Service (APHIS) reports a new spillover of the H5N1 avian flu into dairy cattle.

This new genotype, D1.1, identified in Nevada, represents a shift from the previously isolated B3.13 genotype, which was thought to be contained.

The new genotype was detected through routine milk testing as part of APHIS's comprehensive National Milk Testing Strategy, now involving 36 states. This proactive measure aims to safeguard the dairy industry and public health from potential outbreaks.

Michael Osterholm, an epidemiologist, emphasized the persistence of the H5N1 problem, stating, "We shouldn't be surprised about a new spillover to cattle, given the very significant activity in waterfowl across much of the United States." This acknowledgment points to the complex nature of viral transmission among wildlife and livestock.

In response to this new threat, APHIS is intensifying its collaboration with state officials in Nevada to trace and curb further spread of the virus. The organization's ongoing efforts include a detailed investigation and forthcoming publications that will provide insights and data to better understand and manage this public health concern.

As the investigation continues, APHIS reaffirms its commitment to maintaining rigorous safety protocols and surveillance to adapt to and mitigate the evolving risks associated with the H5N1 avian flu.