March 10, 2023 – The 2022-23 flu season lingered through the second half of January and most of February at the edge of its defined existence, but it now appears to be over.
For the CDC, the annual epidemic known as flu season “occurs when flu activity is higher than a CDC-defined ‘baseline’ value.” That value, expressed as the proportion of all outpatient visits involving influenza-like illness to health care providers in the U.S. Outpatient ILI Surveillance Network, is currently 2.5%.
Over the last 6 weeks, the national figure has been between 2.6% (Feb. 19-25), and 2.7% (Jan. 15-21). In other…
