nprnews_____ = ||| lubuntu at wor2|||COVID-19 Vaccine Candidate Heads To Widespread Testing In U.S.||| kickerpage = |||no kicker pagenpr for NPRNEWS||| summarynpr = |||A vaccine candidate developed by the U.S. company Moderna and the National Institutes of Health starts its final phase of testing Monday. It’s one of a handful of candidates to reach this stage.