-
Now Playing: Moderna plans to test COVID-19 vaccine in children
-
Now Playing: Vaccine Watch: Battling vaccine misinformation
-
Now Playing: Biden announces purchase of 200M more doses of COVID-19 vaccines
-
Now Playing: Should I upgrade my mask to protect against COVID-19 variants?
-
Now Playing: Using humor to upgrade your health, work and life
-
Now Playing: What you need to know about South African COVID-19 variant
-
Now Playing: New vaccine efficacy concerns raised as new COVID-19 variants found in the US
-
Now Playing: Vaccine rollout remains dire as concerns about international COVID variants grow
-
Now Playing: New information on link between mental health, heart disease
-
Now Playing: These healthy eating resolutions offer small life changes with a big impact
-
Now Playing: New Jersey governor on mass COVID-19 vaccination sites, short supply
-
Now Playing: A robot cleaner sings and tells jokes at a hospital in Germany
-
Now Playing: Brazilian COVID variant arrives in US
-
Now Playing: Dr. Fauci on new COVID-19 travel restrictions, working with Trump
-
Now Playing: UK hospitals struggling with spike in COVID-19 patients
-
Now Playing: Biden aiming for 1.5 million vaccinations a day across the country
-
Now Playing: Can you spread COVID-19 after getting vaccine?
-
Now Playing: Doctor uses church to bring vaccine awareness to Black community
-
Now Playing: US reimposes travel restrictions to contain spread of COVID-19 variants
-
Now Playing: The truth about racial disparities and COVID-19 vaccine