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A woman pushes a wheel barrow of trash she has collected in the Petionville Camp at the edge of Port au Prince, Haiti. With some 50,000 residents packed onto what was once a golf course, it's the largest camp of hundreds of locales hosting more than a million people left homeless by the January 12, 2010 quake. Attending to camp hygiene has been even more importance since cholera began sickening--and killing--Haitians in late 2010.