This special edition of Outbreak Outlook examines an unexpected turn in this year's flu season. Influenza activity is rebounding aggressively, with outpatient influenza-like illness (ILI) now surpassing its January peak to hit 7.0%. In the past 22 years (i.e., dating back to the 2002-2003) season, only four other seasons have seen a peak that high. And although there are a few years with a double peak, only the 2019-2020 season was comparable in intensity.