Nevada has reported multiple cattle herds test positive for an unprecedented H5N1 strain, D1.1, showing respiratory symptoms. This strain has been linked to severe human cases, contrasting with the milder B3.13 strain previously found in cattle. The emergence of D1.1 challenges former beliefs about the rarity of bird flu spilling over into cows. The USDA aims to maintain its eradication strategy despite these developments, as the risk also poses significant challenges to poultry and public health.
The detection does not change USDA's HPAI eradication strategy. The goal remains to stop the unprecedented surge of highly pathogenic avian influenza, or HPAI.
The D1.1 strain has emerged in recent months to dominate infections in wild birds and poultry flocks across North America; symptoms in humans are more severe.
This discovery disrupts previous theories that the spillover into cows was a rare event, with all earlier cases linked only to the less severe B3.13 strain.
Respiratory symptoms are now being reported in cows, with multiple herds in Nevada testing positive for the D1.1 strain of bird flu.
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