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 and poultry with transmission to humans primarily in dairy and poultry workers. 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, Madera County Department of Public Health (MCDPH), in coordination with the California Department of Public Health (CDPH) and the Centers for Disease Control and Prevention (CDC), have identified cases of H5N1 bird flu in individuals who had contact with infected dairy cattle residing in Madera County.

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For more information, including the number of reported human H5N1 cases in California, visit CDPH's Current Bird Flu Situation webpage.

 

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

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