Two weeks after a federal committee of vaccine advisers approved new recommendations for who should get Covid-19 shots , Health and Human Services Secretary Robert F. Kennedy Jr. hasn’t given his approval, leaving states unable to order updated shots for low-income children.

That’s according to two immunization program experts, who spoke on the condition of anonymity to avoid reprisal from the administration. The experts said that without approval from the highest health officials, updated Covid shots meant for the Vaccines for Children program, which provides free or low-cost vaccines to low-income children, haven’t yet been shipped.

According to one expert, the lack of approval leaves those who rely on the VFC program — roughly 50 percent of U.S. children — unable to access the shots

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