Weekly US Influenza Surveillance Report: Key Updates for Week 5, ending February 1, 2025
www.cdc.gov
Key Updates for Week 5, ending February 1, 2025

It’s probably not even bird flu, yet.

Remember to get your flu shots every year, and a reminder that sine common diseases like covid can take a toll on your immune system and harm your ability fight off other diseases, especially in the few months after infection.

That might be why you’ve been hearing a lot of “why am I sick all the time” in the past couple years.

Key Points

• Seasonal influenza activity remains elevated and continues to increase across the country.

• During Week 5, of the 4,377 viruses reported by public health laboratories, 4,264 were influenza A and 113 were influenza B. Of the 3,458 influenza A viruses subtyped during Week 5, 1,857 (53.7%) were influenza A(H1N1)pdm09, 1,601 (46.3%) were A(H3N2), and 0 were A(H5).

• Outpatient respiratory illness is increasing and remains above baseline nationally for the tenth consecutive week. All 10 HHS regions are above their region-specific baseline.

• One human infection with an influenza A(H1N2) variant (A(H1N2)v) virus was reported.

• No new influenza A(H5) cases were reported to CDC this week. To date, human-to-human transmission of influenza A(H5) virus has not been identified in the United States.

• Ten pediatric deaths associated with seasonal influenza virus infection were reported this week, bringing the 2024-2025 season total to 57 pediatric deaths.

• CDC estimates that there have been at least 24 million illnesses, 310,000 hospitalizations, and 13,000 deaths from flu so far this season.

• CDC recommends that everyone ages 6 months and older get an annual influenza (flu) vaccine.1

• 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.2

• Influenza viruses are among several viruses contributing to respiratory disease activity. CDC is providing updated, integrated information about COVID-19, flu, and respiratory syncytial virus (RSV) activity on a weekly basis.