Sanitation is patchy, with the habit of outdoor defecation, so dangerous when so many are in such close proximity, hard to break.
ECONOMIST: Many survivors of October's earthquake are still at risk
As of 2006, an estimated 2.5bn people had no access to sanitary facilities, and nearly one in four people in developing countries was practicing open defecation.
BBC: Move to cut child diarrhoea death
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