Health Information Portal (HIP)

Philadelphia Influenza Surveillance Updates: PDPH tracks influenza activity in Philadelphia, especially severe influenza disease. Providers should report all hospitalized influenza cases, influenza deaths in children, and influenza outbreaks in closed settings like long-term care facilities and shelters.

Week 10: Influenza diagnoses at local emergency departments decreased for all age groups during week 10. Positive detections of influenza A at select local hospital laboratories remained high but decreased during week 10 following the seasonal peak. Detections for Influenza B increased during week 10. Data from all facilities are complete from Week 8 2025 forward. Twenty-five influenza outbreaks in long-term care facilities have been reported and confirmed (≥ 1 case of laboratory-confirmed flu reported in a long-term care facility) so far this season.

Week 10 Report: Click here to download the last weekly report of influenza activity (March 2, 2025 through March 8, 2025) in a printable format.

State and National Influenza Surveillance Updates:

Pennsylvania: As of March 8, 2025, the Pennsylvania Department of Health (PADOH) reported Influenza activity is very high but has decreased in previous weeks. Activity levels in PA are based on laboratory-confirmed influenza cases. For more information, please visit: https://www.pa.gov/en/agencies/health/diseases-conditions/infectious-disease/respiratory-viruses/respiratory-virus-dashboard.html.

United States: As of March 8, 2025, the CDC reported that influenza activity remained high nationally but has decreased for four consecutive weeks. In week 10, clinical laboratories reported 16,027 (16.1%) of 99,634 specimens tested positive for influenza, 79.5% of which were influenza A. Of influenza A specimens subtyped at public health labs, 57.6% have been subtyped as H1N1 and 42.4% as H3N2. In week 10, 25 jurisdictions reported high to very high levels of influenza activity, including high activity reported in New Jersey. The remaining 29 jurisdictions with sufficient data reported minimal to moderate activity, including moderate activity reported in Pennsylvania. Activity levels were calculated from outpatient data reported to ILINet. For more information, please visit: https://www.cdc.gov/fluview/surveillance/2025-week-10.html.