Bird Flu update for 02-12-2025

As of the last 48 hours, the avian influenza, particularly the H5N1 and H5N9 strains, continues to be a significant public health concern in the United States and globally. In the U.S., the outbreak of H5N1 bird flu has resulted in substantial losses in poultry and dairy industries. Since early 2022, the virus has led to the death of over 156 million birds across all 50 states and Puerto Rico[3]. Recently, there have been multiple detections of H5N1 avian flu in poultry flocks across nine states, including a major layer farm in Pennsylvania with nearly 2 million birds, and several farms in Ohio, California, and Maryland. These outbreaks have exacerbated egg supply shortages and highlighted the ongoing impact on commercial and backyard flocks[3]. The USDA has confirmed the first case of H5N9 bird flu in poultry in the United States, specifically on a California poultry farm, where almost 119,000 birds have been killed since early December. This new strain has raised concerns about potential human infections and the possibility of it becoming a pandemic subtype, although this is still under investigation[2]. As of late January 2025, there have been approximately 67 human cases of H5N1 bird flu reported in the U.S., resulting in one death. These cases are primarily among individuals with job-related or recreational exposures to infected animals, such as farmers, poultry workers, and animal care personnel. The CDC emphasizes that while the current public health risk to the general public remains low, those with direct exposure to infected animals are at increased risk[4][5]. The CDC, in collaboration with federal, state, and local partners, continues to monitor the situation closely. They have implemented extensive surveillance, testing, and characterization of the virus, as well as provided guidance on prevention and mitigation strategies, including the use of personal protective equipment (PPE) and post-exposure prophylaxis with antiviral medications. There is currently no recommendation for vaccination against H5N1 bird flu, but preparations for a potential vaccination program are underway[4]. Globally, H5N1 bird flu remains widespread in wild birds, contributing to ongoing outbreaks in poultry and other animals. The CDC and other health agencies are vigilantly watching the situation to assess any changes in the virus's behavior that could pose a greater risk to human health. In summary, the bird flu outbreak continues to affect animal populations significantly in the U.S. and worldwide, with sporadic human cases primarily among those with direct animal exposure. While the general public risk is considered low, ongoing surveillance and preparedness efforts are crucial to managing this public health threat.