[The] CDC released a new study Friday that underscores the effectiveness of Covid-19 vaccines against serious illness or death. The study, which examined hospitalizations and deaths from Covid-19 over a period of more than three months, found that unvaccinated people are more than 10 times more likely to be hospitalized with Covid-19 than those who have been vaccinated, and 11 times more likely to die of the virus, according to CDC director Rochelle Walensky.