Usman (right), 7 months, and Abdullah (left), 18 months, are held by their mothers while they wait to receive the polio vaccine at the Jalozai refugee camp near Peshawar, Pakistan.
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Medical workers treat Ebola patients at the Eternal Love Winning Africa hospital in Monrovia, Liberia. Three workers at the hospital, including Dr. Kent Brantly (left), have tested positive for Ebola.
Courtesy of Samaritan's Purse
The CDC's director, Tom Frieden, testified before a congressional subcommittee Wednesday regarding a recent anthrax incident and lab safety improvements he is instituting.
Dogs throughout Latin America carry the Chagas parasite — and boost the risk of people catching it. And it's not just shelter dogs, like these in Mexico, who are at risk. Even family dogs get the deadly disease.
Jose Luis Gonzalez /Reuters/Landov