Dr. Sheik Humar Khan, who died of the disease he was helping to fight, posed for a picture in Kailahun, Sierra Leone, on June 25. Umaru Fofana /Reuters /Landov hide caption

itoggle caption Umaru Fofana /Reuters /Landov

A single snail from an air cargo shipment of 67 live snails that arrived at Los Angeles International Airport on July 1. Officials said that the 35 pounds of snails arrived from Nigeria along with paperwork stating they were for human consumption. Greg Bartman/AP hide caption

itoggle caption Greg Bartman/AP

Government health workers administer blood tests to check for the Ebola virus in Kenema, Sierra Leone, June 25. Reuters/Landov hide caption

itoggle caption Reuters/Landov