mRNA vaccines slash risk of COVID-19 infection by 91 percent in fully vaccinated people, study finds

People who receive mRNA COVID-19 vaccines are up to 91 percent less likely to develop the disease than those who are unvaccinated, according to a new nationwide study. For those few vaccinated people who do still get an infection, or 'breakthrough' cases, the study suggests that vaccines reduce the severity of COVID-19 symptoms and shorten its duration.