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Cholera and a newer threat, dysentery, have killed at least 50,000 Rwandan refugees in the last two weeks, and humanitarian officials fear that their plan to have refugees return from border camps in Zaire could spread disease throughout Rwanda. The rescue effort itself is drawing controversy: physicians are criticizing the U.N. World Food Program for transporting choleric refugees back to Rwanda's capital, Kigali. In one wave, 16 ill people apparently infected 700 others.