Infectious Disease
Two students receive a tuberculin test in New York City, 1962. Library of Congress hide caption
There's a risk of infection with roundworms from kinkajou poo. Joel Sartore/Getty Images hide caption
A safety push had led to a decline in infections from central lines in ICUs. iStockphoto.com hide caption
Sales of Gilead's Truvada pill against HIV aren't getting a boost from data that show it can prevent infection. Paul Sakuma/AP hide caption
Maryland hospitals are promoting hand washing among other measures to prevent patient infections. Leah-Anne Thompson/iStockphoto.com hide caption
Eggs were at the center of a big salmonella outbreak in 2010 that brought more attention to food safety. Justin Sullivan/Getty Images hide caption
Evidence is piling up in support of zinc's ability to ease cold symptoms. iStockphoto.com hide caption
Not all young girls avoid dirt. Hannah Rose Akerley, 7, plays in a gigantic lake of mud at the annual Mud Day event in Westland, Mich., last July. Bill Pugliano/Getty Images hide caption
Microsoft founder Bill Gates, his wife Melinda French Gates and British Prime Minister David Cameron at the World Economic Forum on January 28, 2011, in Davos, Switzerland. Johannes Eisele/AFP/Getty Images hide caption