Flu is expected to flare up in U.S. this winter, raising fears of a 'twindemic'

Health officials are predicting this winter could see an active flu season on top of potential COVID surges. In short, it's a good year to be a respiratory virus. Left: Image of SARS-CoV-2 omicron virus particles (pink) replicating within an infected cell (teal). Right: Image of an inactive H3N2 influenza virus. (NIAID/Science Source)

The flu virtually disappeared for two years as the pandemic raged. But influenza appears poised to stage a comeback this year in the U.S., threatening to cause a long-feared "twindemic."

While the flu and the coronavirus are both notoriously unpredictable, there's a good chance COVID cases will surge again this winter, and troubling signs that the flu could return too.