“Some portion of this steep rise in cases is related to the fact that more people are being tested for the flu than in previous years. Over the month of November, about twice as many flu tests were done at clinical labs nationwide as during the same period last year (about 540,000 versus 265,000). More testing means more cases will get picked up.
However, there are corroborating warning signs that this is truly a bad season. Flu hospitalizations have been off the charts and are rising quickly. In a press conference Monday, CDC director Rochelle Walensky said there have already been 78,000 flu hospitalizations this season, or nearly 17 out of every 100,000 Americans. That’s “the highest we’ve seen at this time of year in a decade,” she said. In keeping with past trends, the highest hospitalization rates are among adults 65 and older.
What’s making these high hospitalization rates particularly concerning is their overlap with surges in other viruses causing many people to get sick enough to require admission. One of those is RSV, which has been packing pediatric hospitals for more than six weeks. And while Walensky noted there were signals RSV transmission was slowing in parts of the country, Covid-19 hospitalizations recently began to tick upward.”
https://www.vox.com/2022/12/6/23494948/flu-influenza-rsv-covid-vaccine-chart-tripledemic-tridemic