H5N1 Avian Influenza

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The Madera County Department of Public Health is monitoring a multi-state outbreak of H5N1 bird flu in dairy cows in the United States. This is the first time that H5N1 bird flu has been found in cows and transmission from cows to humans has been reported. H5N1 bird flu was first detected among cows in California in August 2024. H5N1 bird flu was first detected among humans in California in October 2024.

To date, there have been no reported cases of H5N1 bird flu in cows or humans in Madera County.

For more information, including the number of reported H5N1 cases in cow herds and the number of reported human H5N1 cases in California and the rest of the United States, visit the CDC’s H5 Bird Flu: Current Situation Summary webpage.

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