Half of American adults fully vaccinated against Covid, Biden officials say

• Biden seeks 70% having at least one dose by Fourth of July
• Moderna says Covid vaccine protects children as young as 12

Half of adult Americans have now been fully vaccinated against Covid-19, the Biden administration said on Tuesday.

Joe Biden previously set a goal of having 70% of adults with at least one dose by 4 July. Vaccine hesitancy or resistance remains a problem, particularly among Republicans, with the rate of shots administered slowing.