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 35: During week 35, influenza diagnoses at local emergency departments remained low. Detections for influenza A and influenza B at select local hospital laboratories remained low during week 35, consistent with the past several weeks. Data from all facilities are complete from Week 8 2025 forward. Twenty-nine 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) during the 2024-2025 season.

Week 35 Report: Click here to download the latest weekly report of influenza activity (August 24, 2025, through August 30, 2025) in a printable format.

State and National Influenza Surveillance Updates:

Pennsylvania: As of August 30, 2025, the Pennsylvania Department of Health (PADOH) respiratory virus summaries remain paused due to low activity. 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 August 30, 2025, the CDC reported that influenza activity remains low. In week 35, clinical laboratories reported 163 (0.4%) of 39,531 specimens tested positive for influenza, 79.8% of which were influenza A. Of influenza A specimens subtyped at public health labs, 72.2% have been subtyped as H1N1. In week 35, 53 jurisdictions with sufficient data reported minimal to low activity, including minimal activity reported for Pennsylvania. Activity levels were calculated from outpatient data reported to ILINet. For more information, please visit: https://www.cdc.gov/fluview/surveillance/2025-week-35.html.