Lt. Gov. Karyn Polito has received her first COVID-19 vaccine shot.

The Republican received the shot Friday at Worcester State University.

Polito, 54, became eligible after the state opened up vaccine eligibility on Monday to anyone 16 or over in Massachusetts.

Gov. Charlie Baker, who is 64, received his first dose of the vaccine earlier this month after the state opened vaccine eligibility to residents 55 and older.

Baker has set a target of immunizing 4.1 million residents by the Fourth of July. The state is already more than halfway to that goal.

Baker has also hinted that changes could be coming later this month to some of the state’s mandates, although he said now isn’t the time for people to let their guard down.

“I expect we’ll have some stuff to say before the end of April,” Baker told reporters Thursday in Pittsfield.

Baker made the comment after being asked about proposals to lift some restrictions, particularly on the use of masks in outdoor settings.

Baker said people still need to continue “to follow the rules and the guidance” and get tested for COVID-19, even after they’ve been vaccinated, to help limit the spread of the virus.

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