On Nov. 3, 5- to 11-year-olds became eligible for the COVID-19 Pfizer vaccine. This map compares the average number of first doses given the week before the eligibility announcement with the week after. Montgomery County takes the lead with 12 school-based clinics over the first weekend, while counties like Dorchester show no increase at all from the previous week. Vaccines for 5- to 11-year-olds made up nearly half, or 44%, of all vaccine doses administered since Nov. 3 statewide.