The strain of bird flu in this current dairy cow outbreak is deadly to domestic poultry but causes less severe illness in cows. (Edwin Remsberg/VWPics/AP)
In July 2024, six farmworkers in Colorado contracted H5N1 bird flu, marking the highest number of cases in a single state. Five of these workers were culling nearly 2 million chickens at a commercial egg-laying farm. The extreme heat, exceeding 104 degrees, made it difficult for workers to wear protective gear, leading to potential exposure. Despite the use of industrial fans to cool the barns, the spread of virus-laden feathers increased the risk.
The outbreak highlights the challenges in maintaining safety protocols under extreme conditions. Health officials reported that, although more cases might be identified, the overall risk to the general public remains low. H5N1 bird flu, while deadly to poultry, causes milder illness in cows and is not typically transmitted between humans.
Federal and state officials praised Colorado’s response, which included rapid testing, distribution of antiviral medication, and real-time notification to the CDC. The concern remains that increased human infections could lead to virus mutations, potentially making it more transmissible and severe.
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