As Haiti struggles to avert a new disaster, Haitians and U.S. public health experts are warning that U.N. troops may in fact be responsible for the deadly cholera outbreak. The strain of the disease matches strains found in Southeast Asia, and a Nepalese contingent is based near the infected Artibonite River. Experts say the strain is uncharacteristic of Haiti and the Caribbean but closely matches the Nepalese troops’ home region.