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In page Pollution of Lake Karachay:

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The Techa River, which provides water to nearby areas, was contaminated, and about 65% of local residents fell ill with radiation sickness. Doctors called it the "special disease" because they were not allowed to note radiation in their diagnoses as long as the facility was secret. In the village of Metlino, it was found that 65% of residents were suffering from chronic radiation sickness.[citation needed] Workers at the plutonium plant were also affected.