As the Delta Variant sweeps across the nation, many are questioning the effectiveness of one vaccine in particular -- the Johnson and Johnson one-shot inoculation taken by more than 13 million Americans. A new study is showing encouraging evidence about how the shot compares to its competitors. 

For more, KCBS Radio news anchor Melissa Culross spoke with Thomas Russo, SUNY Distinguished Professor and Chief of the Infectious Diseases division University at Buffalo.