coronavirus December 3, 2020 7:11 am Moderna To Test Vaccine in Children Moderna hopes to enroll about 3,000 kids between the ages of 12 and 17 in a clinical trial. Participants would have to take two doses of the vaccine four weeks apart. Half the group would get a placebo. US & World Videos 5:39 Billerica police sergeant hit and killed by excavator during construction detail 2:30 Arrests made in string of home break-ins targeting Asian-Americans 1:49 2 mail carriers targeted in Dorchester robberies 4:06 Students vote no confidence in Emerson president following protest arrests 2:12 New Patriots QB Drake Maye introduced at Gillette: ‘Can't beat this!'