Findings of abnormalities in these monkeys have been continuously reported in British scientific journals. Researchers assume that the monkeys ingested items like tree bark contaminated with radioactive cesium emanating from the Fukushima Daiichi Nuclear Power Station.
Tohoku University's Department of Pathology professor emeritus Manabu Fukumoto and his research team performed hematological analysis of adult monkeys captured after the nuclear disaster. They inspected blood cell counts in the bone marrow of 18 monkeys caught in locations within 40 kilometers from the plant, including the city of Minamisoma and the town of Namie. Fukumoto's team then compared the data to that of monkeys from other areas. The results revealed various substances destined to mature into blood, like cells that develop into platelets, had decreased in Fukushima monkeys.
Furthermore, the team observed some blood components had greatly decreased in monkeys with higher internal radiation exposure per day. They estimated the radiation dose from the concentration of radioactive cesium in the monkeys' muscles. Fukumoto explained, "We need to conduct long-term research to see if it (the abnormalities) has an effect on the monkeys' health."
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https://mainichi.jp/english/articles/20181125/p2a/00m/0na/003000c