A recent CDC study with data collected from a network covering 500,000 health care personnel (HCP) shows that mRNA vaccines are effective against symptomatic illness in real-world conditions. It found that COVID-19 symptomatic illness was reduced by 94% among HCP who were fully vaccinated, defined in this study as seven or more days after receiving the 2nd dose, and by 82% among those who were partially vaccinated, defined in this study as 14 days after the 1st dose or six days after the 2nd dose. These findings support CDC’s recommendation that everyone should get both doses of an mRNA COVID-19 vaccine to get the most protection.
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