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 52: Influenza diagnoses at local emergency departments sharply increased for all age groups during week 52. Positive detections of influenza A at select local hospital laboratories also increased, while detections for Influenza B remained low. Two influenza outbreak have been reported and confirmed (≥ 1 case of laboratory confirmed flu reported in a long-term care facility) so far this season.

Week 52 Report: Click here to download the last weekly report of influenza activity (December 22, 2024 through December 28, 2024) in a printable format.

State and National Influenza Surveillance Updates:

Pennsylvania: As of December 28, 2024, the Pennsylvania Department of Health (PADOH) reported that both influenza A and B activities have increased for week 52. PADOH has resumed weekly summaries for trends related to Influenza, RSV, and COVID-19. 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 December 28, 2024, the CDC reported that influenza activity is continuing to increase nationally. In week 52, clinical laboratories reported 11,912 (18.7%) of 63,682 specimens tested positive for influenza, 98.0% of which were influenza A. Of influenza A specimens subtyped at public health labs, 40.7% have been subtyped as H1N1 and 59.3% as H3N2. In week 52, 42 jurisdictions reported high to very high levels of influenza activity, including high activity reported in Pennsylvania and very high activity in New Jersey. The remaining 12 jurisdictions reported low to moderate activity . Activity levels were calculated from outpatient data reported to ILINet. Of note, two human infections of influenza A (H3N2) variant viruses were recently reported by the Minnesota Department of Health. For more information, please visit: https://www.cdc.gov/fluview/surveillance/2024-week-52.html