COVID 19 vaccine: Moderna vaccine was reported by company to convey about 80.2% efficacy after first dose. However, The World Health Organization stated " efficacy of approximately 92 % in protecting against COVID-19, starting 14 days after the 1st dose." Studies showed that the Pfizer vaccine became 90% effec-tive 21 days after the first shot.
Answered 2/15/2021
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