Seasonal Influenza Activity Increasing Across the U.S.
The United States is experiencing a notable increase in seasonal influenza activity, with elevated levels reported across the country. The latest data suggests a growing trend in flu cases, highlighting the need for continued vigilance and preventive measures.
Key Points
– In Week 4, public health laboratories reported 2,693 viruses, mostly influenza A, indicating a significant presence of the virus.
– Subtypes of influenza A include A(H1N1)pdm09 and A(H3N2), with outpatient respiratory illnesses on the rise.
– All 10 HHS regions are reporting levels above their baseline, underscoring the widespread nature of the flu.
Pediatric Deaths and Recommendations
– Sixteen pediatric deaths linked to seasonal flu were reported in Week 4, bringing the total for the 2024-2025 season to 47.
– CDC estimates over 20 million flu-related illnesses, 250,000 hospitalizations, and 11,000 deaths so far this season.
– CDC strongly recommends annual flu vaccination for all individuals aged 6 months and older to reduce the risk of infection.
– Prescription antiviral medications are available for the treatment of flu, particularly for high-risk patients.
Virologic Surveillance
– Influenza virus testing in clinical laboratories shows an increase in positive cases, with influenza A dominating the results.
– Public health laboratories are actively monitoring influenza subtypes to track the spread of the virus.
– Genetic and antigenic characterization of influenza viruses is ongoing to assess vaccine efficacy and antiviral susceptibility.
Outpatient and Emergency Department Surveillance
– ILINet data indicates a rise in respiratory illness visits, exceeding the national baseline for the ninth consecutive week.
– Respiratory illness activity is observed across all age groups, reflecting the broader impact of the flu.
– Hospital admission rates due to flu-related illnesses are increasing nationwide, with varying levels by age group.
Hospitalization and Mortality Surveillance
– FluSurv-NET data shows a high number of laboratory-confirmed influenza hospitalizations, with rates reaching peak levels for the season.
– Mortality surveillance reveals a stable percentage of deaths attributed to flu, underscoring the severity of the virus.
– Pediatric deaths associated with influenza remain a concern, highlighting the importance of vaccination and early treatment.
Overall, the U.S. is facing a significant flu season with rising cases, hospitalizations, and pediatric deaths. Continued monitoring, vaccination, and adherence to public health guidelines are essential to mitigate the impact of seasonal influenza on the population.