Bird Flu Outbreak 2026: 7.6 Million Birds Affected in Pennsylvania as H5N1 Spreads Nationwide

# Bird Flu Outbreak Update

A significant bird flu outbreak continues to spread across the United States, with Pennsylvania emerging as a major hotspot. According to the United States Department of Agriculture, 27 flocks in Pennsylvania have tested positive in 2026, impacting more than 7.6 million birds. Most cases are concentrated in Lancaster County, the center of the state's 7.1 billion dollar poultry industry, with one additional case reported in Dauphin County. Officials say bird deaths have also been reported in Philadelphia and Bucks County as the outbreak expands into southeastern counties.

The CDC reports that since February 2024, there have been 71 confirmed human cases of A(H5) bird flu in the United States, resulting in 2 deaths. Of these cases, 41 were associated with dairy herds, 24 with poultry farms and culling operations, and 3 with other animal exposures. The agency notes the current public health risk remains low, with no person-to-person spread detected at this time.

Beyond Pennsylvania, the outbreak has reached California's northern elephant seal populations. According to researchers at UC Davis, seven weaned northern elephant seal pups tested positive for H5N1 in early March. Scientists had been monitoring closely following a catastrophic 2023 outbreak that devastated southern elephant seal populations in South America. The early detection allowed California State Parks to swiftly close seal-viewing areas and cancel guided tours for the remainder of the season.

The USDA reports that in the past 30 days, avian flu has been confirmed among 67 flocks nationwide, including 36 commercial flocks and 31 backyard flocks, affecting a total of 11.54 million birds. Major commercial operations were hit hard, with a facility in Hyde County, North Carolina reporting 3.2 million affected birds and a facility in Jefferson County, Wisconsin reporting 1.2 million.

According to Penn State Extension experts, the virus is spreading through direct contact with infected birds as well as contaminated equipment and clothing. Cases are increasing during the spring migration of wild birds. Scientists remain concerned that climate change is creating more opportunities for bird flu to spread across species as unpredictable weather and warming winters impact avian behavior and migration patterns.

Thank you for tuning in to this bird flu update. Be sure to come back next week for more health and science news. This has been a Quiet Please production. For more information, check out Quiet Please Dot A I.

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