AdvertisementNIH Director 'Guardedly Optimistic' About COVID-19 Vaccine Approval By End Of 202011:01Download AudioResumeOctober 20, 2020James DoubekSteve InskeepfacebookEmailDr. Francis Collins, director of the National Institutes of Health, is pictured on Sept. 9 on Capitol Hill. Collins says a vaccine would not be approved for emergency use before late November at the earliest. (Greg Nash/Pool/Getty Images)
