Vaccines currently authorized and recommended to prevent COVID-19
mRNA (messenger RNA) vaccines have similar ingredients and require two doses for full protection. The Pfizer-BioNTech vaccine series is given 21 days apart, and the Moderna vaccine series is given 28 days apart. The Pfizer-BioNTech vaccine is recommended for people aged 16 years and older, while the Moderna vaccine is recommended for those 18 years and older. In clinical trials the Pfizer-BioNTech vaccine was 95% effective at preventing laboratory-confirmed COVID-19 illness, while the Moderna vaccine was 94.1% effective at preventing laboratory-confirmed COVID-19 illness.