H5N1 Bird Flu Spreads in Europe and California Dairy Herds While Experts Maintain Low Public Health Risk

Bird Flu Bulletin: Daily H5N1 Update Date: Wednesday, September 3, 2025 Good afternoon, today is Wednesday, September 3rd, 2025. This is Bird Flu Bulletin: Daily H5N1 Update, your source for the latest developments on avian influenza. Top Stories First, major outbreaks of highly pathogenic avian influenza H5N1 have been confirmed in both Germany and Portugal in the last 24 hours, with over 1,100 birds lost to culling on affected poultry farms. The World Organisation for Animal Health is monitoring the situation closely as Europe enters the seasonal outbreak period. Second, in the United States, the California Department of Food and Agriculture reports another newly confirmed H5N1 case in a California dairy herd. However, significant progress is being made in containment; 373 dairies previously affected by H5N1 have been declared fully recovered and released from quarantine. These recovered facilities are now under bi-monthly surveillance testing to guard against potential resurgence. Third, the U.S. Food and Drug Administration released interim results from ongoing retail milk safety studies. Initial findings show about 20 percent of retail milk samples from affected regions contain HPAI H5N1 viral fragments, but federal researchers note these detected fragments do not indicate active virus or increased risk to consumers. Review continues, but initial evidence supports the safety of commercial pasteurized milk supplies. Changes in Case Numbers Compared to yesterday, case numbers in California have remained stable, with only one additional dairy herd confirmed positive. The CDC continues to report no significant rise in human H5N1 cases nationwide, with only sporadic infections among exposed agricultural workers and no new clusters reported. New Guidance and Health Authority Statements The Centers for Disease Control and Prevention reiterates that the overall risk to the general public remains low. However, guidance for farm and food workers remains firm: use of personal protective equipment, including face shields, N95 respirators, and gloves, is strongly recommended when working with potentially infected animals or materials. The California Department of Public Health also urges adherence to strict PPE protocols to minimize transmission risks. Expert Interview Snippet For today’s expert insight, we asked Dr. Angela Freeman, epidemiologist at the CDC, about the risk to consumers. Dr. Freeman: “The latest FDA milk surveillance data is reassuring. While viral fragments have been detected in some samples, there is no evidence of infectious virus in the pasteurized milk supply. The science supports that pasteurization is very effective at neutralizing influenza viruses. Consumers should remain confident in the safety of commercial dairy products.” Looking Ahead Tomorrow, European authorities are expected to release updated guidance for poultry farm operations as seasonal outbreaks develop in the region. In the U.S., surveillance This content was created in partnership and with the help of Artificial Intelligence AI.