The two Covid 19 vaccines that are furthest along in clinical trials — those made by Moderna and Pfizer — each require two doses. Moderna’s is being given to volunteers in two doses 28 days apart; Pfizer’s is being delivered in two doses 21 days apart.
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What you you need to know about The COVID19 VACCINE
David Martin reports on the military efforts underway to inoculate 300 million Americans with an anticipated COVID-19 vaccine.
