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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 1: Febrile/flu-like illnesses at emergency departments declined for all age groups during week 1. Additionally, 38 specimens were reported as positive for influenza A or B from our 6 sentinel hospitals, a continued decrease from previous weeks. Since Oct 3, 2021, there have been 128 reports of severe influenza (Philadelphia resident, positive by rapid test, PCR or culture, and hospitalized for ≥ 24 hrs). Seven influenza outbreaks have been reported this season (≥ 1 case of laboratory confirmed flu reported in a long term care facility or other high-risk congregate setting). No influenza-associated death was reported for week 1, and two have been reported thus far this season.

Current Report: Click here to download the last weekly report of influenza activity (from January 2, 2022 through January 8, 2022) in a printable format.






State and National Influenza Surveillance Updates:

Pennsylvania: As of January 8, 2022, the Pennsylvania Department of Health (PADOH) reported a slight decrease in flu activity this week. There have been 26,143 laboratory confirmed cases of influenza (positive by rapid test, PCR, or culture) reported so far this season, with influenza A remaining as the predominant type. There have been confirmed reports from all 67 counties. Fourteen deaths have been reported so far this season. For more information, please visit:

United States: As of January 8, 2022, the CDC reports that seasonal influenza activity decreased slightly this past week, though overall activity is still elevated. In week 1, clinical laboratories reported 2,203 specimens (2.2%) of 102,412 specimens tested positive for influenza. The majority of virus detections have been influenza A. Outpatient visits for respiratory illness decreased this week, but is still above the national baseline. Hospitalizations for influenza have also declined. This week, fourteen jurisdictions reported moderate levels of flu activity and 21 jurisdictions had high activity. For more information, please visit: