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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 47:

Positive detections of influenza at select local hospital laboratories have remained low, though influenza A activity did increase again compared to the previous week. Influenza A percent positivity is now at 2.1% while influenza B percent positivity is 0.3%. Data on severe influenza (Philadelphia resident, positive by rapid test, PCR or culture, and hospitalized for ≥ 24 hrs) is forthcoming and will be released in a future flu report. One influenza outbreak has been reported (≥ 1 case of laboratory confirmed flu reported in a long term care facility) so far this season.

Please note: Emergency department data is pending and will be updated next report.

Current Report: Click here to download the last weekly report of influenza activity (November 19 through November 25, 2023) in a printable format.

Flu A counts 23-24 wk47

Flu B Counts 23-24 wk47

Flu Percents this Season 23-24 wk47

State and National Influenza Surveillance Updates:

Pennsylvania: As of November 25, 2023, the Pennsylvania Department of Health (PADOH) reported that flu activity is increasing. Emergency department visits resulting in an influenza diagnosis are also increasing for most age groups across the state. Influenza A and B have both been detected by the PA public health lab, with influenza A/H1N1 being the most prevalent subtype. Ten deaths have been reported so far this season. For more information, please visit:

United States: As of November 25, 2023, the CDC reports that seasonal influenza activity is increasing, with the highest activity occurring in the Southeast, South-Central, Mountain, and West Coast regions. In week 47, clinical laboratories reported 4,336 specimens (6.2%) of 69,884 specimens tested positive for influenza, 75.1% of which have been influenza A. Of influenza A specimens subtyped at public health labs, 82.2% have been subtyped as H1N1 and 17.8% as H3N2. Influenza hospitalizations are increasing and 8 of 10 HHS regions are now at or exceeding their outpatient respiratory illness baselines. Ten jurisdictions reported moderate flu activity while 13 jurisdictions experienced high levels of flu activity. For more information, please visit: