Hybrid immunity from a COVID-19 infection plus a vaccine provided an immune boost against symptomatic disease, as well as severe outcomes, Brazilian researchers found.
A study published on Thursday found that pregnancy nearly doubles the risk of breakthrough COVID-19 cases, closely followed in risk by a solid organ transplant.
Vaccine effectiveness against hospitalization held steady in children aged 5 to 11 years, however, and among adolescents ages 12 to 18 years, two doses of the vaccine remained highly protective against critical illness requiring life support.
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