The physical space of the MSK Library is permanently closed to visitors as of Friday, May 17, 2024. Please visit this guide for more information.
The physical space of the MSK Library is permanently closed to visitors as of Friday, May 17, 2024. Please visit this guide for more information.
Confirmed and probable cases are typically updated by 5 PM EST on Mondays (for cases confirmed by CDC on Friday, Saturday, or Sunday), Wednesdays (for cases confirmed by CDC on Monday or Tuesday), and Fridays (for cases confirmed by CDC on Wednesday and Thursday). Affected states may report cases more frequently.
| Exposure Associated with Commercial Agriculture & Related Operations | |||||
| State | Dairy Herds (Cattle) | Poultry Farms & Culling Operations | Other Animal Exposure | Exposure Source Unknown | State Total |
| California | 36 | 0 | 0 | 1 | 37 |
| Colorado | 1 | 9 | 0 | 0 | 10 |
| Iowa | 0 | 1 | 0 | 0 | 1 |
| Louisiana | 0 | 0 | 1 | 0 | 1 |
| Michigan | 2 | 0 | 0 | 0 | 2 |
| Missouri | 0 | 0 | 0 | 1 | 1 |
| Oregon | 0 | 1 | 0 | 0 | 1 |
| Texas | 1 | 0 | 0 | 0 | 1 |
| Washington | 0 | 11 | 0 | 0 | 11 |
| Wisconsin | 0 | 1 | 0 | 0 | 1 |
| Source Total | 40 | 23 | 1 | 2 | 66 |
NOTE: One additional case was previously detected in a poultry worker in Colorado in 2022. Louisiana reported the first H5 bird flu death in the U.S.
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.
CDC has multiple surveillance systems that are used year-round to monitor key flu indicators. These data are reviewed comprehensively each week. Taken together, as of January 10, 2025, these systems currently show no indicators of unusual flu activity in people, including avian influenza A(H5N1) viruses.
| Case Reporting | 3 cases detected through national flu surveillance |
|---|---|
| Public Health Laboratory Monitoring | Since February 25, 2024, 83,048 specimens have been tested using a protocol that would have detected A(H5) and other novel viruses. |
| Clinical Laboratory Trends |
CDC has not identified any unusual trends in reported clinical laboratory data at the national, state, or local levels. |
| Emergency Departments |
CDC has not identified any unusual trends in emergency department visits associated with influenza or potentially related symptoms at the national, state, or local levels. |
| Wastewater Surveillance | For the week ending January 04, 2025, 300 sites reported results for avian influenza A(H5) in wastewater, and 51 (17.0%) sites from 1 state (California) reported H5 detections. |
CDC numbers are based on weekly state aggregate reports since 2022. CDC defers to states for updated information on people being monitored and tested. March 24, 2024, was the date of the first reported dairy cow infections in the United States.
| February 2022 - Present |
CDC and state and local health departments monitor people exposed to infected birds, poultry, dairy cows or other animals for 10 days after exposure. Between February 2022 and now, there have been:
|
|---|---|
| Current HPAI Outbreak (2024) | CDC and state and local health departments monitor people exposed to infected birds, poultry, dairy cows and other animals for 10 days after exposure. Between March 24, 2024, and now, there have been:
66 human cases detected through targeted H5 surveillance |