The county recorded more influenza cases in 2022 than in any other year over the past decade. Experts don't know exactly why case numbers were so high, especially in the fall, but they have some good guesses.
So far, this flu season has been a doozy. By the time November was over, it might have felt like everyone you knew had the flu.
She added that flu cases were so low the two prior seasons, that scientists weren’t able to fully study the effectiveness of the flu vaccines in those years. Almost half of the cases were in kids 17 and under, whereas in 2020 and 2021 more than half the cases were in the 18 to 49 population, the data show. Kids were a smaller portion of cases in almost every season before COVID-19.Another factor experts are still trying to figure out is whether COVID-19 alters the body’s immune system to make it more susceptible to other illnesses like influenza. UC San Diego’s Smith said it might.
Overall, the lack of widespread flu across the community in 2020 and 2021 could also make the broader population more susceptible now that our socializing has increased, he said.
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