Video
Shop
Culture
Family
Wellness
Food
Living
Style

Travel
News
Book Club

Newsletter

Privacy Policy
Your US State Privacy Rights
Children's Online Privacy Policy
Interest-Based Ads
Terms of Use
Do Not Sell My Info
Contact Us
© 2026 ABC News

VIDEO: What you need to know about COVID-19 vaccine efficacy

2:23

gma3
March 5, 2021

What you need to know about COVID-19 vaccine efficacy

Dr. Darien Sutton explains what efficacy really means and what the initial vaccination data tells us.

Up Next in news

Senate Republicans hold up COVID relief package

Senate Republicans hold up COVID relief package

VIDEO: Grand jury indicts former FBI director over Instagram post

Grand jury indicts former FBI director over Instagram post

VIDEO: Trump orders Navy to 'shoot and kill' any boat laying mines in Strait of Hormuz

Trump orders Navy to 'shoot and kill' any boat laying mines in Strait of Hormuz

The latest lifestyle and entertainment news and inspiration for how to live your best life - all from Good Morning America.

Contests
Terms of Use
Privacy Policy
Do Not Sell My Info
Children’s Online Privacy Policy
Advertise with us

Your US State Privacy Rights
Interest-Based Ads
About Nielsen Measurement
Press
Feedback

Shop FAQs
ABC News
ABC
All Videos
All Topics

Sitemap

© 2026 ABC News

Privacy Policy—
Your US State Privacy Rights—
Children's Online Privacy Policy—
Interest-Based Ads—
Terms of Use—
Do Not Sell My Info—
Contact Us—

© 2026 ABC News