Commonground
Senior Moderator
Weekly Snapshot for Week Ending October 5, 2024
AT A GLANCE
CDC influenza (flu) surveillance systems show no indicators of unusual influenza activity in people, including avian influenza A(H5N1).
Overview
This page provides information on how CDC systems that monitor national, state, and local level influenza data are being used during the current avian influenza A(H5N1) situation.
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
Main Findings from Surveillance Systems
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 October 11, 2024, these systems currently show no indicators of unusual flu activity in people, including avian influenza A(H5N1) viruses.
Case Reporting
Total Reported Human Cases of H5 in the United States since 2022: 19
Human Cases of H5 Following Exposure to Dairy Cows since April 1, 2024: 8
Human Cases of H5 Following Exposure to Poultry since April 28, 2022: 10 (9 in 2024)
Human Cases of H5 with No Immediately Known Animal Exposure: 1 (Reported 9/6/2024)
States with Reported Case(s): California, Colorado, Michigan, Missouri, Texas
Public Health Laboratory Monitoring
No novel influenza A positive test results, including for influenza A(H5) virus, were reported by public health laboratories for the week ending October 5, 2024.
Clinical Laboratory Trends...
Emergency Departments...
Wastewater Surveillance
For the week ending October 5, 2024, 309 of 328 sites reported results for avian influenza A(H5) in wastewater, and 5 (1.5%) sites from 1 state reported H5 detections.
Data presented through: 10/05/2024; Data as of: 10/09/2024:
--Exposure Source Table..
.
--Novel Influenza A Virus Infections Map...
--Public health laboratory reporting...(Graph) Monitoring for changes in tests positive for influenza in clinical settings (Graph)
- While these laboratories don't test specifically for influenza A(H5) virus, by tracking the percentage of specimens tested that are positive for influenza A viruses, we can monitor for unusual increases in influenza activity that may be an early sign of spread of novel influenza A viruses, including H5.
--Monitoring for changes in emergency department visits for influenza
--Monitoring for Avian Influenza A(H5) Virus In Wastewater
https://www.cdc.gov/bird-flu/h5-monitoring/index.html
AT A GLANCE
CDC influenza (flu) surveillance systems show no indicators of unusual influenza activity in people, including avian influenza A(H5N1).
Overview
This page provides information on how CDC systems that monitor national, state, and local level influenza data are being used during the current avian influenza A(H5N1) situation.
- Influenza virus and illness activity are monitored year-round through a collaborative effort between CDC and many partners, including state, local, and territorial health departments; public health and clinical laboratories; clinics; and emergency departments.
- Human cases of novel influenza, which are human infections with non-human influenza A viruses that are different from currently spreading seasonal human influenza viruses, are nationally notifiable. Every identified case is investigated and reported to CDC.
- CDC is actively looking at multiple flu indicators during the current situation to monitor for influenza A(H5N1) viruses, including looking for spread of the virus to, or among people, in jurisdictions where the virus has been identified in people or animals.
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
- At least 5,100 people monitored
- At least 2,560 with exposures to dairy cows
- At least 2,600 with exposures to birds and other animals including poultry (non-dairy cow source)
- At least 250 persons tested for novel influenza A
- At least 85 with exposures to dairy cows
- At least 170 with exposures to birds and other animals including poultry (non-dairy cow source)
Main Findings from Surveillance Systems
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 October 11, 2024, these systems currently show no indicators of unusual flu activity in people, including avian influenza A(H5N1) viruses.
Case Reporting
Total Reported Human Cases of H5 in the United States since 2022: 19
Human Cases of H5 Following Exposure to Dairy Cows since April 1, 2024: 8
Human Cases of H5 Following Exposure to Poultry since April 28, 2022: 10 (9 in 2024)
Human Cases of H5 with No Immediately Known Animal Exposure: 1 (Reported 9/6/2024)
States with Reported Case(s): California, Colorado, Michigan, Missouri, Texas
Public Health Laboratory Monitoring
No novel influenza A positive test results, including for influenza A(H5) virus, were reported by public health laboratories for the week ending October 5, 2024.
Clinical Laboratory Trends...
Emergency Departments...
Wastewater Surveillance
For the week ending October 5, 2024, 309 of 328 sites reported results for avian influenza A(H5) in wastewater, and 5 (1.5%) sites from 1 state reported H5 detections.
Data presented through: 10/05/2024; Data as of: 10/09/2024:
--Exposure Source Table..
.
--Novel Influenza A Virus Infections Map...
--Public health laboratory reporting...(Graph) Monitoring for changes in tests positive for influenza in clinical settings (Graph)
- While these laboratories don't test specifically for influenza A(H5) virus, by tracking the percentage of specimens tested that are positive for influenza A viruses, we can monitor for unusual increases in influenza activity that may be an early sign of spread of novel influenza A viruses, including H5.
--Monitoring for changes in emergency department visits for influenza
--Monitoring for Avian Influenza A(H5) Virus In Wastewater
https://www.cdc.gov/bird-flu/h5-monitoring/index.html