Kenyan health officials take the temperatures of passengers arriving at the Nairobi airport on Thursday. Kenya has no reported cases of Ebola, but it's a transportation hub and so is on alert. Simon Maina/AFP/Getty Images hide caption

itoggle caption Simon Maina/AFP/Getty Images

A Tunisian protester holds a baguette while taking to riot police in January 2011. Martin Bureau/AFP/Getty Images hide caption

itoggle caption Martin Bureau/AFP/Getty Images