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Cholera has sickened nearly 500,000 people and killed more than 6,500 others since it surfaced in Haiti in October 2010, according to the Haitian Health Ministry.

Evidence suggests that the disease was brought to Haiti by a U.N. battalion from Nepal, where cholera is endemic, and spread throughout the country after a local contractor failed to properly sanitize a U.N. base.

From wire dispatches and staff reports