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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 6:

Positive detections of influenza A at select local hospital laboratories have fluctuated over the past few weeks, though influenza B continues to increase. A preliminary count of 75 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. Seventeen influenza outbreaks have been reported and confirmed (≥ 1 case of laboratory confirmed flu reported in a long-term care facility) this season. Please note that emergency department visit data for week 6 are pending and will be updated in a future report.

Current Report: Click here to download the last weekly report of influenza activity (February 4, 2024 through February 10, 2024) in a printable format.

Flu A Counts

Flu B counts

Flu percents this season

State and National Influenza Surveillance Updates:

Pennsylvania: As of February 10, 2024, the Pennsylvania Department of Health (PADOH) reported that influenza A and B activity increased. Emergency department visits resulting in an influenza diagnosis also increased among most age groups and areas. There have been 112,256 influenza positive laboratory tests reported so far this season. Influenza A/H1N1 remains the most prevalent subtype identified among those tested at the PA Bureau of Laboratories. Two hundred and seventy deaths have been reported to date this season. For more information, please visit:

United States: As of February 10, 2024, the CDC reports that seasonal influenza activity remains high among most parts of the country and that some areas experienced increases compared to the previous week. In week 6, clinical laboratories reported 15,474 specimens (15.7%) of 98,553 specimens tested positive for influenza, 61.8% of which have been influenza A. Of influenza A specimens subtyped at public health labs, 59% have been subtyped as H1N1 and 41% as H3N2. Influenza hospitalizations were stable compared to the previous week and all 10 HHS regions are still exceeding their outpatient respiratory illness baselines. Ten jurisdictions reported moderate flu activity while 27 jurisdictions experienced high levels of flu activity. For more information, please visit: