University of Michigan pauses vaccinations for people in phase 1B due to low supply Michigan Medicine to make sure people from phase 1A can get second dose of vaccine Published: Tags: ANN ARBOR, Mich. – Due to lower-than-expected COVID-19 vaccine supply, the University of Michigan has paused vaccinations of people in the state’s 1B phase. U of M Medicine announced it will temporarily pause the scheduling of vaccinations for people in that phase and first make sure there are enough doses for people in the first phase who need their second dose. “We are committed to administering COVID-19 vaccines to our communities as quickly and safely as possible,” the announcement reads. “We currently have established capacity to administer up to 12,000 vaccines per week, and will resume scheduling new first-dose appointments as soon as sufficient supply is available.”