Protection against Covid-19 mRNA vaccines is likely to last at least nine months, according to an FDA official
11 US states have already vaccinated 50% of adults with at least one dose of vaccine, according to CDC data
50% of adults in the United States expect to have at least one dose of Covid-19 vaccine by the end of this week
50% of adults in the United States expect to have at least one dose of Covid-19 vaccine by the end of this week