What to know
- H5 bird flu is widespread in wild birds worldwide and is causing outbreaks in poultry and U.S. dairy cows with several recent 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 H5 bird flu activity in people.
Current situation
H5N1 Bird Flu Human Cases in U.S.
On July 7, 2025, CDC streamlined H5N1 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 reported monthly.
- USDA data on HPAI detections in animals will no longer be reported on the CDC website. These data can be found on USDA's website.
National situation summary
Situation summary of confirmed and probable human cases since 2024
When a case tests positive for H5 at a public health laboratory but testing at CDC is not able to confirm H5 infection, per Council of State and Territorial Epidemiologists (CSTE) guidance, a case is reported as probable.
National flu surveillance (since February 25, 2024)
Note: National flu surveillance data will be updated on the first Friday of every month.
Targeted H5 surveillance (since March 24, 2024)
Note: Targeted H5 surveillance data will be updated on the first Friday of every month.
Detections in Animals
For data on HPAI detections in animals, visit the USDA website.