What to know about hantavirus

The World Health Organization says the strain of hantavirus identified on the cruise ship heading toward Spain may have passed through human-to-human transmission. But thanks to a robust public health response and the high bar for that transmission, many medical experts believe the risk of the virus spreading among the general public is low. The World's Host Carolyn Beeler speaks with epidemiologist Syra Madad about what we know so far.