H5N1 Bird Flu Spreads Rapidly Across US Dairy Herds with 299 Infected Farms and 20 Human Cases Reported

Bird Flu Bulletin: Daily H5N1 Update Saturday, October 11, 2025 This is Bird Flu Bulletin: Daily H5N1 Update. Today is Saturday, October 11, 2025. Here are the day’s top stories and the latest on the global H5N1 situation. Top Stories First, the spread of H5N1 continues to accelerate in livestock and wild birds across the United States. The USDA reports that 299 dairy herds in 14 states are now confirmed with H5N1 infections. In California, cases have soared from 56 affected dairy herds last week to 100 herds today, according to the latest USDA figures. Outbreaks have also been confirmed in Minnesota turkey farms, impacting over 100,000 birds, and new cases were detected in backyard flocks in Montana, Arkansas, Idaho, and Oregon. The avian influenza season is now considered in full swing, particularly in the Midwest and South, with over 4.4 million birds affected in the past 30 days, as per the University of Minnesota Center for Infectious Disease Research and Policy. Second, the cumulative number of human H5N1 cases in the U.S. since April 2024 now stands at 20, up by two cases compared to yesterday. All six recently confirmed cases in California were among dairy workers, experiencing only mild symptoms and none requiring hospitalization. The Centers for Disease Control and Prevention emphasizes that these cases remain sporadic and primarily linked to animal exposures, not sustained human-to-human transmission. Testing of additional suspected cases is ongoing. Third, health authorities are issuing updated guidance to those working directly with animals or near outbreak zones. The California Department of Public Health newly stresses the need for personal protective equipment, recommending N95 respirators, gloves, and face shields for all animal handlers or farm workers. The CDC continues to state that, for the general public, the current risk remains low, but vigilance is crucial as the season progresses. Case Numbers Compared to Yesterday Today, the number of infected dairy herds in California increased by a significant 44 compared to last week, with 100 herds now affected. Nationally, reported outbreaks in commercial and backyard flocks rose by at least five new locations, and two new human cases were added in California in the last 24 hours, according to CDC updates. Expert Interview To better understand the human health risk, here’s a brief snippet from Dr. Elise Carter, infectious disease expert at the CDC: "Right now, what we’re seeing is animal-to-human transmission primarily among individuals with direct farm exposure. There is still no evidence of widespread community transmission. Protecting workers with proper PPE remains our best defense at this stage." New Guidance Both CDC and state authorities maintain the guidance that all farm and animal workers should strictly use personal protective equipment, including N95 masks, gloves, and eye protection. California officials reiterate the requirement for bi-monthly dairy s This content was created in partnership and with the help of Artificial Intelligence AI.