B Investigation of the Cause of Minamata Disease
1. Investigation of the Cause of Minamata Disease

After May 1, 1956 when the outbreak of Minamata disease was firstly discovered, Study Group of Kumamoto University reported that the cause of the disease was intoxication caused by eating fishes and shellfishes contaminated with a kind of heavy metal on Nov. 3, 1956.

But it took a long time to determine the cause of the strange disease as a methylmercury poisoning.