October 30 – Reflections on the Day the Earth Moved for H5N1

On October 30, 2024, significant developments regarding H5N1 avian influenza emerged, marking a critical point in the ongoing situation. The first natural infection of a domestic pig with H5N1 was reported in Oregon, where a mixed species farm also experienced an outbreak in poultry. This incident is notable as it represents the first confirmed case of H5N1 in pigs in the U.S. Additionally, California reported new infections in broiler flocks, bringing the total to seven confirmed cases across the U.S. and Canada. In Utah, eight dairy herds tested positive for H5N1, while Washington State reported its ninth human case linked to the outbreak. The USDA announced a new national bulk tank surveillance initiative aimed at monitoring H5N1 in dairy herds, which will involve testing milk from infected areas and potentially expanding to other regions. This initiative signifies a major policy shift towards mandatory testing, reflecting the seriousness of the situation. The genetic sequencing of the virus from the infected pig indicates it is a wild bird strain, distinct from the dairy strain seen in other states. The implications of these findings underscore the need for ongoing monitoring and protective measures for both livestock and public health.

- First confirmed case of H5N1 in a domestic pig in the U.S. reported in Oregon.

- USDA initiates national bulk tank surveillance for H5N1 in dairy herds.

- California and Utah report multiple new H5N1 infections in poultry and dairy herds.

- The strain found in the Oregon pig is identified as a wild bird strain.

- Ongoing monitoring and worker protection are critical in managing H5N1 risks.