A child waves to Boston Red Sox mascot, Wally the Green Monster, dressed in a medical white coat outside Fenway Park, Monday Feb. 1, 2021, in Boston. Fenway Park is one of several large COVID-19 vaccination sites in the Boston area. (AP Photo/Elise Amendola)

People wait on line outside a regional COVID-19 vaccination site, Monday, Feb. 1, 2021, in Wakefield, Mass. (AP Photo/Elise Amendola)

Healthcare volunteer Melissa Lowry prepares a COVID-19 vaccine at a regional vaccination site, Monday, Feb. 1, 2021, in Wakefield, Mass. (AP Photo/Elise Amendola)

People wait on a socially distanced line at a regional COVID-19 vaccination site, Monday, Feb. 1, 2021, in Wakefield, Mass. (AP Photo/Elise Amendola)

Maria Brincheiro, 84, receives a COVID-19 vaccine at a regional vaccination site, Monday, Feb. 1, 2021, in Wakefield, Mass. (AP Photo/Elise Amendola)

Gino Ferrusi, 78, far left, sits in a recovery area with others after receiving a COVID-19 vaccine at a regional vaccination site, Monday, Feb. 1, 2021, in Wakefield, Mass. (AP Photo/Elise Amendola)