Children and adolescents are two times more likely to develop long COVID after a second infection, a study found. The study, published Sept. 30 in Lancet Infectious Diseases, used data from the electronic medical records of about 465,000 people younger than 21 at 40 children’s hospitals. Children in the study had either a first or second coronavirus infection between Jan. 1, 2022, and Oct. 13, 2023, and the study focused on the omicron wave.

Here are five things to know: 1. Over a six-month period, the incident rate of long COVID after two infections among young people was 1,884 per million. This was twice the rate of those who had only one infection. 2. Tens of thousands of people in the study who did not receive a long COVID diagnosis were treated for conditions that could be symptoms o

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