Flu shot worked well this season

Early estimates suggest the flu vaccine performed well in a U.S. winter flu season that has already dissipated.

The vaccines were more than 40% effective in preventing adults from getting sick enough from the flu that they had to go to a doctor's office, clinic or hospital, health officials said during a Centers for Disease Control and Prevention vaccines meeting Wednesday. Officials generally are pleased if a flu vaccine is 40% to 60% effective.

One reason is the vaccine was a good match against the strains that spread over the fall and winter, officials say.

But one expert at the meeting was underwhelmed and said it points out the need for better flu vaccines. “It is still disappointing” that the vaccine was a good match and yet effectiveness was still modest, said Dr. Sarah Long of Drexel University.

Annual flu vaccines are recommended for everyone 6 months and older in the U.S. About half of eligible kids and just under half of adults got flu shots in the past several months, according to CDC data. Vaccination rates were up compared with 2021-2022, but below what they were before the COVID-19 pandemic hit in 2020, said the CDC's Brendan Flannery.

Initially, it looked like it might be a bad flu season. The virus took off in early November as COVID-19 and another respiratory virus, RSV, roiled emergency departments. Among kids, flurelated hospitalization rates in November and December were as high as any seen in recent years, Flannery said. At least 111 flu deaths have been reported in children.