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 2: Influenza diagnoses at local emergency departments increased for all age groups during week 2. Positive detections of influenza A at select local hospital laboratories remained high. Note that data starting Week 1 are incomplete from one facility, so counts will likely increase. Detections for Influenza B remained low. Ten influenza outbreaks have been reported and confirmed (≥ 1 case of laboratory confirmed flu reported in a long-term care facility) so far this season.

Week 2 Report: Click here to download the last weekly report of influenza activity (January 5, 2025 through January 11, 2025) in a printable format.

State and National Influenza Surveillance Updates:

Pennsylvania: As of January 11, 2025, the Pennsylvania Department of Health (PADOH) reported that both influenza A and B activities declined but remain high, with the potential to increase in the coming weeks, similar to previous seasons. 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 January 11, 2025, the CDC reported that influenza activity is continuing to increase nationally. In week 2, clinical laboratories reported 21,655 (18.8%) of 115,267 specimens tested positive for influenza, 97.2% of which were influenza A. Of influenza A specimens subtyped at public health labs, 43.1% have been subtyped as H1N1 and 56.8% as H3N2. In week 2, 35 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 19 jurisdictions with sufficient data reported minimal 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