Look for flu and COVID-19 infections to ramp up in the coming weeks, U.S. health officials say, with increases fueled by holiday gatherings, too many unvaccinated people and a new version of the coronavirus that may be spreading more easily.
High levels of flu-like illnesses were reported last week in 17 states — up from 14 the week before, the Centers for Disease Control and Prevention said Friday.
“Folks are traveling a lot more this season. They want to see their families,” said the CDC’s Dr. Manisha Patel. “And all of that sort of adds to the mix” in the spread of viruses.
Health officials are keeping an eye on a version of the ever-evolving coronavirus, known as JN.1. The omicron variant was first detected in the U.S. in September and now accounts for an estimated 20% of cases. The CDC expects it to reach 50% in the next two weeks, Patel said.
It may spread easier or be better at evading our immune systems, but there is no evidence that the strain causes more severe disease than other recent variants, health officials say. And current evidence indicates vaccines and antiviral medications work against it.
As for flu, early signs suggest current vaccines are well-matched to the strain that is causing the most illnesses, and that strain usually doesn’t cause as many deaths and hospitalizations as some other versions.
But the bad news is vaccinations are down this year, officials say. About 42% of U.S. adults had gotten flu shots by the first week of December, down from about 45% at the same time last year, according to the CDC.