A(H5) Bird Flu: Current Situation

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What to know

  • A(H5) bird flu is widespread in wild birds worldwide and is causing outbreaks in poultry and U.S. dairy cows with sporadic human cases in U.S. dairy and poultry workers.
  • While the current public health risk is low, CDC is watching the situation carefully and working with states to monitor people with animal exposures.
  • CDC is using its flu surveillance systems to monitor for A(H5) bird flu activity in people.
H5N1 Bird Flu How is it Spreading?

Current situation

A(H5) Bird Flu Human Cases in U.S.

On July 7, 2025, CDC streamlined A(H5) bird flu updates with routine influenza data updates and updated reporting cadences to reflect the current public health situation. As such, the following changes were made to this page: Data on the number of people monitored and tested for bird flu are available at A(H5) Bird Flu Surveillance and Human Monitoring | Bird Flu | CDC and are reported monthly. USDA data on highly pathogenic avian influenza (HPAI) detections in animals will no longer be reported on the CDC website. These data can be found on USDA's website. CDC will continue to report any additional human cases of A(H5) bird flu here and in FluView.

National situation summary since 2024

Footnote: Of the 71 total reported human cases of A(H5) bird flu reported in the United States since February 2024, seven were detected through national flu surveillance and 64 were detected through human monitoring.

Resource

Novel flu case data by season and virus subtype are available
FluView Interactive

Situation summary of confirmed and probable human cases since 2024

When a case tests positive for A(H5) at a public health laboratory but testing at CDC is not able to confirm A(H5) infection, per Council of State and Territorial Epidemiologists (CSTE) guidance, a case is reported as probable. In January 2025, CDC updated requirements. After a public health laboratory's first three cases of influenza A(H5) virus have been confirmed by CDC, subsequent detections by that laboratory can be considered confirmatory.

A(H5)

Targeted A(H5) surveillance (since March 24, 2024)

Note: Targeted A(H5) surveillance data will be updated on the first Friday of every month.

Bird flu surveillance

Additional A(H5) bird flu surveillance, testing, and people monitoring data are available.
Surveillance & Human Monitoring

Detections in Animals

For data on HPAI detections in animals, visit the USDA website.

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Content Source:
National Center for Immunization and Respiratory Diseases (NCIRD)