IE 11 is not supported. For an optimal experience visit our site on another browser.

Dr. Jha: Vaccine booster shot may not be needed until next year

03:29

Dr. Ashish Jha, the Dean of the Brown University School of Public Health, tells Lawrence O'Donnell that those fully-vaccinated may not have to worry about getting a booster shot until next year unless the coronavirus variants start causing a lot of breakthrough infections.