Commonground
Senior Moderator
May 16, 2025
KEY POINTS
Seasonal influenza activity is low and declining.
Summary
Viruses
Clinical Lab 2.9% (Trend
)
positive for influenza
this week. Public Health Lab Influenza A(H1N1)pdm09, A(H3N2), and B
viruses were co-circulating this week.
Illness
Outpatient Respiratory Illness 1.9% (Trend
)
of visits to a health care provider this
week were for respiratory illness
(below baseline). Activity Map 0 moderate jurisdictions 0 high or very high jurisdictions FluSurv-NET 128 per 100,000
cumulative hospitalization rate National Healthcare Safety Network (NHSN) Hospital Respiratory Data 2,008 (Trend
)
patients admitted to hospitals
with influenza this week. NCHS Mortality 0.2% (Trend
)
of deaths attributed to influenza this week. Pediatric Deaths 1 influenza-associated deaths
were reported this week for
a total of 227 deaths this season.
All data are preliminary and may change as more reports are received.
Directional arrows indicate changes between the current week and the previous week. Additional information on the arrows can be found at the bottom of this page.
A description of the CDC influenza surveillance system, including methodology and detailed descriptions of each data component is available on the surveillance methodspage.[SUP]1[/SUP]
Additional information on the current and previous influenza seasons for each surveillance component are available on FluView Interactive.
Key Points
Nationally, and in HHS regions 1, 2, 6, and 8, the percentage of respiratory specimens testing positive for influenza virus in clinical laboratories decreased (change ≥ 0.5 percentage points) compared to week 18. Percent positivity remained stable in regions 3, 4, 5, 7, 9, and 10 (change < 0.5 percentage points) compared to the previous week. Influenza A and B viruses were co-circulating this week. For regional and state level data and age group distribution, please visit FluView Interactive. Viruses known to be associated with recent receipt of live attenuated influenza vaccine (LAIV) or found upon further testing to be a vaccine virus are not included, as they are not circulating influenza viruses. Clinical Laboratories
Continued: https://www.cdc.gov/fluview/surveillance/2025-week-19.html
KEY POINTS
Seasonal influenza activity is low and declining.
Summary
Viruses
Clinical Lab 2.9% (Trend
positive for influenza
this week. Public Health Lab Influenza A(H1N1)pdm09, A(H3N2), and B
viruses were co-circulating this week.
Illness
Outpatient Respiratory Illness 1.9% (Trend
of visits to a health care provider this
week were for respiratory illness
(below baseline). Activity Map 0 moderate jurisdictions 0 high or very high jurisdictions FluSurv-NET 128 per 100,000
cumulative hospitalization rate National Healthcare Safety Network (NHSN) Hospital Respiratory Data 2,008 (Trend
patients admitted to hospitals
with influenza this week. NCHS Mortality 0.2% (Trend
of deaths attributed to influenza this week. Pediatric Deaths 1 influenza-associated deaths
were reported this week for
a total of 227 deaths this season.
All data are preliminary and may change as more reports are received.
Directional arrows indicate changes between the current week and the previous week. Additional information on the arrows can be found at the bottom of this page.
A description of the CDC influenza surveillance system, including methodology and detailed descriptions of each data component is available on the surveillance methodspage.[SUP]1[/SUP]
Additional information on the current and previous influenza seasons for each surveillance component are available on FluView Interactive.
Key Points
- Seasonal influenza (flu) activity is low and declining.
- This season is classified as a high severity season overall and for all age groups (children, adults, older adults) and is the first high severity season since 2017-2018.
- During Week 19, of the 501 viruses reported by public health laboratories, 334 were influenza A and 167 were influenza B. Of the 327 influenza A viruses subtyped during Week 19, 195 (59.6%) were influenza A(H1N1)pdm09, 132 (40.4%) were A(H3N2), and 0 were A(H5).
- No new influenza A(H5) cases were reported to CDC this week. To date, human-to-human transmission of avian influenza A(H5) virus (H5 bird flu) has not been identified in the United States.
- Nationally, outpatient respiratory illness remained stable this week and is below baseline. All HHS regions are below their region-specific baselines.
- Based on data from FluSurv-NET, the cumulative hospitalization rate for this season is the highest observed since the 2010-2011 season.
- One pediatric death associated with seasonal influenza virus infection was reported this week, bringing the 2024-2025 season total to 227 pediatric deaths. So far this season, among children who were eligible for influenza vaccination and with known vaccine status, 90% of reported pediatric deaths have occurred in children who were not fully vaccinated against influenza.
- CDC estimates that there have been at least 47 million illnesses, 610,000 hospitalizations, and 27,000 deaths from flu so far this season.
- CDC continues to recommend that everyone ages 6 months and older get an annual flu vaccine as long as influenza viruses are circulating.[SUP]1[/SUP]
- There are prescription flu antiviral drugs that can treat flu illness; those should be started as early as possible and are especially important for patients at higher risk for severe illness.[SUP]2[/SUP]
- Influenza viruses are among several viruses contributing to respiratory disease activity. CDC is providing updated, integrated informationabout COVID-19, flu, and respiratory syncytial virus (RSV) activity on a weekly basis.
Nationally, and in HHS regions 1, 2, 6, and 8, the percentage of respiratory specimens testing positive for influenza virus in clinical laboratories decreased (change ≥ 0.5 percentage points) compared to week 18. Percent positivity remained stable in regions 3, 4, 5, 7, 9, and 10 (change < 0.5 percentage points) compared to the previous week. Influenza A and B viruses were co-circulating this week. For regional and state level data and age group distribution, please visit FluView Interactive. Viruses known to be associated with recent receipt of live attenuated influenza vaccine (LAIV) or found upon further testing to be a vaccine virus are not included, as they are not circulating influenza viruses. Clinical Laboratories
Continued: https://www.cdc.gov/fluview/surveillance/2025-week-19.html