How mass NYC subway swab could change public health

Aired: 2/6/2015 | 0:03:25 | Clip
Scientists in New York recently searched the city's subway system and found all kinds of germs that could cause everything from the common cold to meningitis. Dr. Christopher Mason, a geneticist at Weill Cornell Medical College who headed the study, joins Alison Stewart to discuss the study's implications on the public health system.