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 15: Influenza diagnoses at local emergency departments decreased for all age groups during week 15. Positive detections of influenza A at select local hospital laboratories continued to decrease during week 15 following the seasonal peak. Detections for Influenza B also decreased during week 15. Influenza B activity has continued to decline over the past few weeks. Data from all facilities are complete from Week 8 2025 forward. Twenty-seven 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 15 Report: Click here to download the last weekly report of influenza activity (April 6, 2025 through April 12, 2025) in a printable format.

State and National Influenza Surveillance Updates:

Pennsylvania: April 12, 2025, the Pennsylvania Department of Health (PADOH) reported Influenza activity is still elevated but continues to decrease. 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 April 12, 2025, the CDC reported that influenza activity continues to decline nationally. In week 15, clinical laboratories reported 4,354 (6.7%) of 65,066 specimens tested positive for influenza, 36.2% of which were influenza A. Of influenza A specimens subtyped at public health labs, 65.1% have been subtyped as H1N1 and 34.9% as H3N2. In week 15, one jurisdiction reported a high level of influenza activity. The remaining 54 jurisdictions with sufficient data reported minimal to moderate activity, including minimal activity reported in Pennsylvania and low activity reported in New Jersey. Activity levels were calculated from outpatient data reported to ILINet. For more information, please visit: https://www.cdc.gov/fluview/surveillance/2025-week-15.html.