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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 17: Influenza diagnoses at local emergency departments decreased slightly for all ages during week 17. Positive detections of influenza A and B at select local hospital laboratories both decreased as well for week 17. A preliminary count of 265 severe influenza cases (Philadelphia resident, positive by rapid test, PCR or culture, and hospitalized for ≥ 24 hrs) have been reported and confirmed so far this season, the majority of which have been influenza A. Several other influenza reports are pending confirmation of hospitalization. Thirty-five influenza outbreaks have been reported and confirmed (≥ 1 case of laboratory confirmed flu reported in a long-term care facility) this season.

Current Report: Click here to download the last weekly report of influenza activity (April 21, 2024 through April 27, 2024) in a printable format.


Flu A counts

Flu B counts

Flu percents this season

State and National Influenza Surveillance Updates:

Pennsylvania: As of April 27, 2024, the Pennsylvania Department of Health (PADOH) reported that influenza A and B activity both decreased. Emergency department visits resulting in an influenza diagnosis also decreased among all age groups and areas. There have been 173,735 influenza positive laboratory tests reported so far this season. Four hundred and forty six deaths have been reported to date this season, including one pediatric death. For more information, please visit:

United States: As of April 27, 2024, the CDC reports that influenza activity is decreasing nationwide. In week 17, clinical laboratories reported 2,263 specimens (3.8%) of 58,844 specimens tested positive for influenza, 58.5% of which were influenza A. Of influenza A specimens subtyped at public health labs, 33.3% have been subtyped as H1N1 and 66.7% as H3N2. Influenza hospitalizations continue to trend downwards. All HHS regions are below their outpatient respiratory illness baselines. In week 17, no jurisdictions reported moderate or high levels of flu activity. For more information, please visit: