What to Know
H5N1 bird flu is widespread in wild birds worldwide and is causing outbreaks in poultry and U.S. dairy cows with four recent human cases in U.S. dairy workers. While the current public health risk is low, the CDC is watching the situation carefully and working with states to monitor people with animal exposures. The CDC is using its flu surveillance systems to monitor for H5N1 activity in people.
Current Situation
H5N1 Monitoring in People
The CDC influenza (flu) surveillance systems show no indicators of unusual influenza activity in people, including avian influenza A(H5N1).
Humans
- Total Reported Human Cases in the United States: 5 (since 2022)
- 4 following exposure to dairy cows (reported between 4/01/2024 and 7/3/2024) | Full Report
- 1 following exposure to poultry (reported on 4/28/2022) | Full Report
- States with Reported Case(s): 3
Wild Birds Detected
- 9,523 (as of 6/26/2024) | Full Report
Poultry Affected
- 97,263,546 (as of 7/1/2024) | Full Report
Dairy Herds Affected
- 138 (as of 7/3/2024) | Full Report
Jurisdictions with Bird Flu in Wild Birds
- 50
States with Outbreaks in Poultry
- 48
States with Outbreaks in Dairy Cows
- 12
H5N1 Detections in the USA
- Dairy cattle: Ongoing multi-state outbreak
- Wild Birds: Widespread
- Poultry Flocks: Sporadic outbreaks
- Mammals: Sporadic infections
- People: 4 cases in the U.S.
- Person-to-person spread: None
- Current public health risk: Low
Note This webpage will be updated daily, Monday through Friday, after 4 p.m. to reflect any new data.
Cumulative data on wild birds have been collected since January 20, 2022. Cumulative data on poultry have been collected since February 8, 2022. Cumulative data on humans in the U.S. have been collected since April 28, 2022. Cumulative data on dairy cattle have been collected since March 25, 2024.