Four more people have been hospitalized with acute brain disorder after eating "sugihiratake" mushrooms, officials in Akita Prefecture said Thursday.
The announcement comes a day after the prefecture reported two new deaths from acute brain disorder and aired suspicions that the mysterious fatalities might be linked to the mushroom variety, known as Angel's Wings in English.
Acute brain disorder is caused by a temporary impairment of brain tissue and can happen to an otherwise normal person.
The four who were confirmed ill on Thursday had all eaten the mushroom variety. Three of the four had previously suffered from kidney ailments, prefectural officials said.