Summary -- What is already known about this topic? - Highly pathogenic avian influenza A(H5N1) outbreaks have emerged in U.S. cattle and poultry . Wastewater surveillance detects influenza A(H5) subtype but does not currently distinguish between human and animal sources. -- What is added by this report? - During September 15, 2021–July 11, 2024 , retrospective analysis of wastewater surveillance data revealed 21 avian influenza A(H5) subtype detections across 12 Oregon communities . No association was found between detections in a community’s wastewater and history of a poultry outbreak or presence of dairy processing facilities or dairy farms within the sewershed. Avian influenza A(H5) was detected most frequently in two communities with important wild bird habitats . -- What are the implications for public health practice? - Wastewater surveillance was an early indicator of avian influenza emergence in Oregon. Nonhuman and noncattle animal inputs , including wild bir...
Media Monitoring for Signals about Emerging Threats