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Perhaps vegetables grown in untreated drainage (aguas negras) should be iodinized or treated with caution. Amebiasis, famous by transmission by foodhandlers, can be also transmitted on the surface of foods.

The larger problem is water supply & drainage, particularly in agricultural countries as in much of Latin America. Recycling scarce water is one very large civic task, and safely fertilizing crops with drainage is another. At the same time, the demand for sanitary services is increasing, because of the population explosion. Then the question can be: What is the role of E. histolytica in current and future water management problems?