Pfizer had requested an FDA authorization for people 65 and older while Moderna requested for people 18 and older.

But the FDA opted to set age 50 as the benchmark for the fourth dose.

The CDC and FDA will continue to evaluate the need of a fourth dose for all Americans.

TheUninsured Program will stop accepting new claimsfor vaccination services around the first week of April.

For the most recent updates on COVID-19, visit ourcoronavirus news page.

Centers for Disease Control and Prevention.Variant proportions.