Just when you thought it was safe to put away the tissues, the flu is making a surprising comeback. New data reveals a resurgence in infections, and it’s not just the usual suspects causing the stir. While the subclade K strain of influenza A has dominated this season, a subtle but noteworthy uptick in influenza B cases is now grabbing attention—particularly among school-aged children. But here’s where it gets intriguing: could this be the start of a spring wave, or just a fleeting blip? Let’s dive in.
Flu activity in the U.S. has seen a slight rebound, driven by a minor increase in influenza B infections. These viruses are distinct from the subclade K strain that’s been the main culprit so far this season. According to Dr. Caitlin Rivers, an epidemiologist who tracks infectious disease trends on her Force of Infection Substack, this resurgence is reminiscent of last year’s pattern, where flu cases climbed to a second peak in late February after an initial decline. ‘We’re seeing a second rebound, concentrated in children aged 5 to 17,’ Rivers explains. ‘Kids often lead the way in new trends, so it’s likely adults will follow suit.’
And this is the part most people miss: Influenza B strains belong to a different viral family, meaning you could catch the flu twice in one season if exposed to different strains. While this year’s vaccine targets two A strains and one B strain, offering some protection against severe illness, it’s not a guarantee against reinfection. Both flu A and B share similar symptoms—high fever, sore throat, cough, body aches, and fatigue—and can be treated with antivirals. But the persistence of H3N2 strains, like the subclade K, often signals a more severe flu season overall.
Data from the CDC’s latest report (https://www.cdc.gov/fluview/surveillance/2026-week-03.html) shows B strains inching up by less than a percentage point, while A strains remain steady. The winter storm that impacted half the U.S. last week may have contributed to this shift, as people huddled indoors, increasing transmission risk. Currently, 29 states report high or very high flu activity, with 10 states at moderate levels. Alarmingly, eight more child flu deaths were reported last week, bringing the season’s total to 52.
Here’s the controversial question: With flu still dominating respiratory infections—ahead of COVID-19 and RSV, both of which are on the rise—are we underestimating the flu’s staying power? While the CDC’s national map highlights the flu’s continued grip, some experts argue that the focus on COVID-19 and RSV has overshadowed the flu’s persistent threat. What do you think? Is the flu getting the attention it deserves, or are we too quick to dismiss it as ‘just the flu’?
As we navigate this evolving landscape, one thing is clear: the flu isn’t going quietly. Whether this rebound is a prelude to a spring wave or a temporary spike, staying vigilant—through vaccination, hygiene, and awareness—remains our best defense. Let’s keep the conversation going: How are you preparing for this unexpected flu resurgence? Share your thoughts in the comments!
