Q3: Did Minamata disease occur in other places as well as Yatsushiro Sea
A3: Niigata Minamata disease, the second outbreak of Minamata disease,
occurred in the Agano River basin of Niigata Prefecture.
A similar disease occurred in the Agano River basin in 1965, 12 years after
the first official reporting of Minamata disease,
This was caused by methylmercury that was discharged in the wastewater
of the Kanose factory of Showa Denko K.K..
These two outbreaks of Minamata disease are included among the four largest
outbreaks of pollution-related diseases, together with Yokkaichi asthma
and Itai-Itai disease.