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Some inhabitants who ate 300-1500 g/ day with an average mercury concentration of
3-4 Mg/ g suffered poisoning. The duration of intake was presumed to be at least
30 days in the area around Agano River, i.e., there was some possibility that a person
who ate contaminated fish with a total mercury content of 1 mg or 0.5 mg methylmercury
may have contracted the disease.
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