The study found that the vaccines remain effective in preventing death in adolescents and children, regardless of which variants are predominant.
The fully vaccinated 12 to 17 year-olds received two doses of either the Moderna or Pfizer-BioNTech mRNA vaccines, and fully vaccinated 3 to 11 year-olds received two doses of inactivated Sinopharm vaccine.
According to the results, estimated vaccine effectiveness against COVID-19 infection was 61 percent in children and 67 percent in adolescents during the Delta wave, but dropped to 16 percent in children and 26 percent in adolescents during the Omicron wave.
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