Hantavirus Outbreak at Yosemite

Hantavirus is a rare cause of disease, but it can be deadly, as visitors to Yosemite Valley are finally been warned. Eight have contracted the mouse-borne ailment since June and three have died. The National Park Service says 22,000 might have been exposed—10,000 of them visitors from around the world. Christina Jewett reports on health and welfare issues for California Watch and the Center for Investigative Reporting.