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 45: During week 45, influenza diagnoses at local emergency departments remained low for all ages. Positive detections for influenza A at select local hospital laboratories increased slightly, while detections for influenza B remained low during week 45. No influenza outbreaks in long-term care facilities have been reported or confirmed (≥ 1 case of laboratory confirmed flu reported in a long-term care facility) during the 2025-2026 season to date.

Week 45 Report: Click here to download the latest weekly report of influenza activity (November 2 - November 8, 2025) in a printable format.

State and National Influenza Surveillance Updates:

Pennsylvania: As of November 8, 2025, the Pennsylvania Department of Health (PADOH) respiratory virus summaries currently list influenza activity as low. Activity levels in PA are based on laboratory confirmed influenza cases. For more information, please visit: https://www.pa.gov/agencies/health/diseases-conditions/infectious-disease/respiratory-viruses/respiratory-virus-dashboard

United States: As of November 8, 2025, the CDC reported that influenza activity remains low but is increasing. In week 45, clinical laboratories reported 867 (2.0%) of 42,928 specimens tested positive for influenza, 89.9% of which were influenza A. Of influenza A specimens subtyped at public health labs, 71.7% have been subtyped as H3N2 and 28.3% have been subtyped as H1N1. In week 45, 53 jurisdictions with sufficient data reported minimal to low activity, including minimal activity reported in Pennsylvania, and 1 jurisdiction reported moderate activity. Activity levels were calculated from outpatient data reported to ILINet. For more information, please visit: https://www.cdc.gov/fluview/surveillance/2025-week-45.html.