H5N1 Bird Flu: Current Situation Summary

Updated April 22, 2024

  • H5N1 bird flu is widespread in wild birds worldwide and is causing outbreaks in poultry and U.S. dairy cows with one recent human case in a U.S. dairy worker.
  • 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 also is studying the virus from the recent human case and has found it is susceptible to flu antiviral drugs. CDC has already made a candidate vaccine virus (CVV) that could be used to make a vaccine if needed.
H5N1 Detections in USA
  • Total Reported Human Cases in the United States: 2 (since 2022)
    • 1 following exposure to dairy cows (reported on 4/01/2024) | Full Report >
    • 1 following exposure to poultry (reported on 4/28/2022) | Full Report >
  • States with Reported Case(s): 2
Dairy Cattle

States with Outbreaks in Cattle


as of 4/16/2024 | Full Report >

Dairy Herds Affected


as of 4/21/2024 | Full Report >

This webpage will be updated weekly on Wednesdays 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.

Protective Actions for People