Covid-19 vaccines were universally recommended for all children ages 6 months and older last season. Spencer Platt/Getty Images

Children who were vaccinated against Covid-19 last season had a “substantially lower risk” of emergency department and urgent care visits related to the virus, according to a report published by the US Centers for Disease Control and Prevention on Thursday.

The vaccines were about 76% effective in preventing these outcomes among healthy children ages 9 months to 4 years and about 56% effective among children ages 5 to 17 when compared to those who did not receive an updated vaccine for the 2024-2025 respiratory virus season, the CDC report said.

The federal analysis was based on data from about 98,000 children who had a health care encounter between late Au

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