The vaccine also was 85% effective at preventing severe disease with COVID-19 - at least 28 days after vaccination. In clinical trials, this vaccine was 66% effective in preventing the COVID-19 virus with symptoms - as of 14 days after vaccination. This vaccine is available under an emergency use authorization. Janssen/Johnson & Johnson COVID-19 vaccine.It requires two shots, given four to eight weeks apart. The vaccine is now also available under an emergency use authorization for children ages 6 months through 17 years old. The second dose can be given four to eight weeks after the first dose. The Moderna COVID-19 vaccine is 94% effective in preventing COVID-19 with symptoms. The FDA has approved the Moderna COVID-19 vaccine, now called Spikevax, to prevent COVID-19 in people age 18 and older. The third shot is given at least eight weeks after the second shot. The first two shots are given three to eight weeks apart. The vaccine is now also available under an emergency use authorization for children ages 6 months through 4 years old. It also contains a lower amount of mRNA than the Pfizer-BioNTech COVID-19 vaccine used for people age 12 and older. It requires two shots, given three weeks apart. This vaccine is about 91% effective in preventing COVID-19 in children ages 5 through 11. The vaccine is available under an emergency use authorization for children ages 5 through 11. The second dose can be given three to eight weeks after the first dose. For people age 12 and older, the Pfizer-BioNTech COVID-19 vaccine involves two shots. The vaccine is 100% effective in preventing COVID-19 in children ages 12 through 15. The Pfizer-BioNTech COVID-19 vaccine is 91% effective in preventing severe illness with COVID-19 in people age 16 and older. The FDA approved Comirnaty after data found the vaccine is safe and effective. The FDA has approved the Pfizer-BioNTech COVID-19 vaccine, now called Comirnaty, to prevent COVID-19 in people age 12 and older.
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