How will COVID-19 vaccines be rolled out?

Pfizer Inc with partner BioNTech SE and Moderna Inc have released trial data showing their COVID-19 vaccines to be about 95% effective at preventing the illness, while AstraZeneca Plc this week said its vaccine could be up to 90% effective. After their approval, the massive U.S. rollout begins. Jillian Kitchener has more.