(CNN) -- Pfizer is coming out with promising data about a vaccine booster, as the Delta variant continues to be a major threat worldwide.
Data shows a third dose of the vaccine can "strongly" boost protection against the Delta variant. It also suggests antibody levels against the Delta variants in people from 18 to 55, who get that third shot, are give times higher.
And for people ages 65 to 85, antibody levels after a third dose are 11 times greater.
Researchers say they're potential for up to 100 fold increase in protection after that third dose.