Oregon Dairy Herd Confirmed with Avian Influenza as Sequencing Begins
USDA-APHIS confirmed highly pathogenic avian influenza in an Oregon dairy cattle herd on November 10, 2026, the state's first case, after months of negative milk surveillance. No sequence has been published yet: whether the virus matches the B3.13 lineage already circulating in U.S. dairy cattle or arrived independently from wild birds will decide how far tracing must reach and which herds get tested next.
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