LANSING (AP) — Michigan announced Wednesday that all people age 50 to 64 can start getting COVID-19 vaccinations on March 22, while those in that group with medical conditions can begin being immunized next week.

It is the largest expansion of eligibility since Jan. 11, when state officials allowed vaccinations of seniors 65 and older and front-line workers such as teachers. The announcement came a day after President Joe Biden said the U.S. expects to take delivery of enough coronavirus vaccine for all adults by the end of May, two months earlier than expected.

Starting Monday, two new priority groups will be eligible: people 50 or older with medical conditions or disabilities, and caregiver family members and guardians who care for children with special health care needs.

More than 40% of Michiganders age 65 and older have gotten at least one shot.

“The more people we can get the safe and effective vaccine, the faster we can return to a sense of normalcy,” Democratic Gov. Gretchen Whitmer said in a statement. “I urge all eligible Michiganders to get one of the three COVID-19 vaccines to protect you, your family and your community.”