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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 19:

For week 19, influenza-like illnesses at emergency departments increased slightly among adolescents and adults. Laboratory detections of influenza and activity overall both remain low. Since October 2, 2022, there have been 608 reports of severe influenza at hospitals (Philadelphia resident, positive by rapid test, PCR or culture, and hospitalized for ≥ 24 hrs). Twenty seven influenza outbreaks have been reported (≥ 1 case of laboratory confirmed flu reported in a long term care facility) so far this season. Thirteen deaths have been reported to date, with one occurring in week 19.

Current Report: Click here to download the last weekly report of influenza activity (May 7 through May 13, 2023) in a printable format.


Flu A Counts 22-23 wk19

Flu B counts 22-23 wk19

Flu by week 22-23 wk19

Flu by Age 22-23 wk19

Flu percents this season 22-23 wk19

State and National Influenza Surveillance Updates:

Pennsylvania: Please note, updated data for week 19 is pending from PADOH. As of April 29, 2023, the Pennsylvania Department of Health (PADOH) has reported that flu activity remains low. Emergency department visits for flu-like symptoms are low as well. Influenza A (H3N2) viruses have been the predominant type detected for most of the season; however, influenza B has been the predominant type detected in the past few weeks. Overall, there have been a total of 186,611 laboratory confirmed cases of influenza (positive by rapid test, PCR, or culture). There have been 169 influenza associated deaths this season. For more information, please visit:

United States: As of May 13 2023, the CDC reports that influenza activity remains low nationwide. Flu related hospital admissions have remained low and nine of 10 HHS regions were below their outpatient respiratory illness baselines. Clinical laboratories have reported 290 influenza detections out of 29,723 specimens tested (1.0%), 36.6% of which tested positive for influenza A. Of influenza A viruses from public health labs that have been subtyped in week 19, one was H3N2 and 11 have been H1N1. One hundred fifty two pediatric deaths have been recorded so far this season. In week 19, no jurisdictions experienced moderate flu activity, and three had high activity. For more information, please visit: