Alex Azar, the head of the U.S. Department of Health and Human Services, took the step using emergency powers he has during the U.S. coronavirus epidemic, which was declared a public health emergency. The directive announced Wednesday will temporarily preempt restrictions in 22 states starting this fall.

The move is designed to help prevent vaccination rates from falling during the pandemic, Azar said.

A Centers for Disease Control and Prevention report said orders for childhood vaccines from doctors’ offices plummeted in late March and early April as their offices closed or saw fewer patients, raising concerns that vaccination rates would fall.

But a survey of pediatricians in May suggested that most offices were open and able to give recommended shots, and more than half were able to take on new patients if needed. Another CDC report from late last month noted New York City saw a rebound in kids getting their shots. Nationwide annual numbers from the agency are not expected for another year.

“Especially as we approach the school season, it is critical that children have easy access to the pediatric vaccinations to enable them to get back to school as schools reopen,” Azar said.

The Trump administration has been pushing for schools and day care centers to reopen, as part of an effort to allow parents to return to work and help revive the economy.