Support WBURCOVID-19 Vaccine: Don't Miss 2nd Dose Because Of Scheduling GlitchesPlay06:53Download AudioAllison AubreyFebruary 16, 2021 ShareNurse Keith Grant got his second dose of Pfizer's COVID-19 vaccine on schedule from registered nurse Valerie Massaro in January at the Hartford Convention Center — 21 days after his first immunization. (AFP via Getty Images)