ZWEDRU CITY, LIBERIA - MARCH 24: An Ivorian refugee transports clothes for washing in a stream also used for drinking water, a practice that worries experts about possible outbreaks of cholera March 24, 2011 in Zwedru City, Liberia. Opposition forces in Ivory Coast have been involved in heavy fighting as they lay siege to the nation's strongman, Laurent Gbagbo, who is refusing to surrender power to Alassane Ouattara, the apparent winner of the November 2010 presidential election.  (Photo by Simon Rawles/Getty Images)