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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 3: For week 3, influenza-like illnesses rebounded for children and adolescents while remaining unchanged for adults. Laboratory detections of influenza continued to decline and activity overall was low, with influenza A remaining the predominant type detected. Since October 2, 2022, there have been 421 reports of severe influenza at non-pediatric hospitals (Philadelphia resident, positive by rapid test, PCR or culture, and hospitalized for ≥ 24 hrs). Data from pediatric hospitals is still pending, and will be updated once received. Twenty four influenza outbreaks have been reported (≥ 1 case of laboratory confirmed flu reported in a long term care facility) so far this season. Ten deaths have been reported to date this season.

Current Report: Click here to download the last weekly report of influenza activity (from January 15 through January 21, 2023) in a printable format.


Flu A counts

Flu B counts 2023 wk 3

Flu by Week 2023 wk3

Flu Type Age Groups 2023 wk3

Flu This Season Percents 2023 wk3

State and National Influenza Surveillance Updates:

Pennsylvania: As of January 21, 2023, the Pennsylvania Department of Health (PDOH) has reported that flu activity has declined and activity is mild overall. Emergency department visits for flu-like symptoms are moderate as well. Influenza A (H3N2) viruses have been identified as the predominant type detected and overall there have been a total of 174,964 laboratory confirmed cases of influenza (positive by rapid test, PCR, or culture). There have been 84 influenza associated deaths this season. For more information, please visit:

United States: As of January 21, 2023, the CDC reports that influenza activity continues to decline nationwide. The cumulative hospitalization rate is higher than the rate observed in week 3 during every previous season since 2010-2011; however, flu hospital admissions have decreased compared to the previous week. Clinical laboratories have reported 2,588 influenza detections out of 84,499 specimens tested (3.0%), 96% of which tested positive for influenza A. Of influenza A viruses that have been subtyped in week 3, 73% have been H3N2 and 27% have been H1N1. Ninety one pediatric deaths have been recorded so far this season. In week 3, 7 jurisdictions experienced moderated flu activity, while 3 had high or very high activity. For more information, please visit: