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Respiratory Viruses

This guide covers viral respiratory infections, including influenza, RSV, and other influenza-like illnesses (ILI)

Weekly U.S. Influenza Surveillance Report (CDC)

Key Updates for Week 8, ending February 22, 2025

Last Updated: February 28, 2025

Nationally, seasonal influenza activity remains elevated nationally but has decreased for two consecutive weeks. Data to date suggests the season has peaked; however, flu-related medical visits, hospitalizations, and deaths remain elevated, and CDC expects several more weeks of flu activity.

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.

 

Influenza
Clinical Labs

24.5% positive for influenza this week

Trend Decreasing
Public Health Labs Influenza A(H1N1)pdm09 and A(H3N2) were the predominant viruses reported this week.
 
Influenza-like Illnesses
Outpatient Respiratory Illnesses

5.8% of visits to a health care provider this week were for respiratory illness (above baseline) 

Trend Decreasing
Regional Activity
8 moderate jurisdictions
41 high or very high jurisdictions
FluSurv-Net Hospitalization Data 99.6 per 100,000 cumulative hospitalization rate
NHSN Hospitalization Data

36,555  patients admitted to hospitals with influenza this week.

Trend Decreasing
NCHS Mortalities

2.8% of deaths attributed to influenza this week.

Trend Stable
Pediatric Deaths 12 influenza-associated deaths were reported this week for a total of 98 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 here.

Additional information on the current and previous influenza seasons for each surveillance component are available on FluView Interactive.

2025 Weekly FluView Reports

All past FluView Reports (2019 - current)

Weekly New York State Influenza Activity Report

Weekly New York State Influenza Surveillance Report

Last Updated: February 28, 2025

 
During the week ending February 22, 2025:
  • Influenza activity was categorized as geographically widespread. This is the 11th consecutive week of widespread activity reported this season.
  • Laboratories tested 59,082 specimens for influenza, of which 29,297 (50%) were positive, a 31% decrease in positive cases compared with the previous week.
  • The number of patients hospitalized with laboratory-confirmed influenza was 1,832, a 25% decrease in hospitalized cases compared with the previous week.
  • Of the 6,553 specimens submitted to WHO/NREVSS laboratories, 2,124 (32.41%) were positive.
    • 1,959 were positive for influenza A
    • 165 for influenza B.
  • The percent of patient visits for influenza-like illness (ILI) from ILINet providers was 3.05%, below the epidemic threshold6 of 4.20%.
  • There were 38 outbreaks reported in hospitals and 24 outbreaks reported in nursing homes, a 28% decerease in hospital and nursing home outbreaks compared with the previous week.
    • Season to date, a total of 761 outbreaks have been reported from hospitals and nursing homes in NYS.
  • There were two influenza-associated pediatric deaths reported this week.
    • 15 influenza-associated pediatric deaths have been reported this season.

 

New York State Department of Health 2024-2025 Flu Monitoring Archives

February

January

December

November

October

New York City Influenza Surveillence

New York City Department of Health and Mental Hygiene Influenza and RSV Surveillance Report

Last Updated: February 28, 2025

 
Highlights for week ending February 22, 2025

  • 11,106 specimens were positive for influenza, a 29% decrease from the previous week;

    • 62% were positive for influenza A
    • 37% were positive for influenza B.
  • 903 specimens were positive for RSV, a 17% decrease from the previous week.
  • Influenza-like illness visits were at 9% of all weekly visits.
  • There was 1 influenza-associated pediatric deaths reported this week.
    • Season to date, a total of 7 influenza-associated pediatric deaths have been reported.
  • There were 3 influenza outbreaks reported from long-term care facilities this week.
    • Season to date, a total of 112 outbreaks have been reported.
Weekly Influenza and RSV Summaries for 2024-2025 Season