Pfizer said Wednesday its Covid-19 vaccine was robustly effective in kids, demonstrating 100% efficacy in a phase three clinical trial testing its shot in adolescents aged 12 to 15. via Technology and News Today https://www.cnbc.com/2021/03/31/covid-vaccine-pfizer-says-shot-is-100percent-effective-in-kids-ages-12-to-15.html