===Investigation===Throughout 1965 and 1966, researchers from the Kumamoto University Research Group (that had been set up to investigate the original outbreak) and Dr. Hajime Hosokawa (the former Chisso hospital director) brought their significant experience from Minamata and applied it to the Niigata outbreak.
O izbruhu zastrupitve z organskim živim srebrom v porečju reke Agano je poročal oblastem v prefekturi 31. maja in svoje ugotovitve predstavil javnosti 12. junija .