Support WBURVaccinating Children Seen As A Key Step Toward COVID-19 Herd ImmunityPlay04:51Download AudioA MartínezMarch 17, 2021 ShareNurse manager Lucy Golding draws up doses of the Moderna COVID-19 vaccine March 14 in Stamford, Conn. Moderna has begun enrolling infants and young children into a vaccine trial. (Getty Images)