Why Johnson & Johnson's COVID-19 vaccine will help in the fight to end the pandemic

On Feb. 27, the Johnson & Johnson COVID-19 vaccine was granted emergency use authorization by the Food and Drug Administration. It’s now the third vaccine approved in the U.S., joining those from Pfizer and Moderna. Yahoo News Medical Contributor Dr. Kavita Patel explains how the Johnson & Johnson vaccine differs and how it will help in the fight to end the coronavirus pandemic.