Moderna says its Covid-19 vaccine is safe and appears effective in adolescents
By John Bonifield and Lauren Mascarenhas Moderna’s Covid-19 vaccine is safe and appears to be effective in adolescents, the company said Tuesday. In a Phase 2/3 trial of 3,732 children ages 12 to 17 in the United States, blood tests showed that the vaccine produced an immune response that was equivalent to earlier findings in adults. The trial wasn’t designed to look specifically at efficacy. However, initial observations found that none of the children who received the vaccine got sick with Covid-19 starting 14 days after their second dose. Four of the children who received the placebo tested positive for