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Pathological findings of Japanese Black Cattle living in the restricted area of the Fukushima Daiichi Nuclear Power Plant accident, 2013–2016
Authors:Jun Sasaki  Kayoko Hiratani  Itaru Sato  Hiroshi Satoh  Yoshitaka Deguchi  Hiroyuki Chida  Masahiro Natsuhori  Takahisa Murata  Kenji Ochiai  Kumiko Otani  Keiji Okada  Nobuhiko Ito
Affiliation:1. Department of Veterinary Pathology, Faculty of Agriculture, Iwate University, Morioka, Iwate, Japan;2. Food Animal Medicine and Food Safety Research Center, Faculty of Agriculture, Iwate University, Morioka, Iwate, Japan;3. Laboratory of Veterinary Pharmacology and Toxicology, Faculty of Agriculture, Iwate University, Morioka, Iwate, Japan;4. Laboratory of Animal Management, Faculty of Agriculture, Iwate University, Morioka, Iwate, Japan;5. Field Science Center, Morioka, Iwate, Japan;6. Laboratory of Veterinary Radiology and Radiation Biology, School of Veterinary Medicine, Kitasato University, Towada, Aomori, Japan;7. Department of Animal Radiology, Graduate School of Agriculture and Life Sciences, The University of Tokyo, Tokyo, Japan;8. Society for Animal Refugee and Environment post Nuclear Disaster, Tokyo, Japan;9. Department of Veterinary Medicine, Faculty of Agriculture, Iwate University, Morioka, Iwate, Japan
Abstract:Fifty‐one Japanese black cattle from four farms in the evacuation zone of the Fukushima nuclear accident were examined pathologically during the period, 2013–2016. We found no evidence of a radiation effect on pathological findings in any of these autopsy cases, although nine cases (3.7%) of enzootic bovine leukosis (EBL) and three cases (1.2%) of goiter were diagnosed. Estimated integrating dose of external exposure in EBL cases ranged from a maximum of 1200 mSv to a minimum of 72 mSv. Clinically, five cases showed wobble, dysstasia or paralysis. Exophthalmos was observed in three cases. Macroscopically, enlarged lymph nodes, multiple irregular masses of intra‐abdominal and intrapelvic adipose tissue, diffuse thickening of the abomasal submucosa with ulceration, and numerous white nodules of myocardium were observed. Histologically, neoplastic lymphoid cells were extensively proliferated and infiltrated in the lesions. Lymphoid tumor cells showed mature or large lymphoblastic appearance. Immunohistochemically, tumor cells were positive for BLA‐36, CD20 and CD5, and negative for CD3. Three cases showed diffuse enlargement of the thyroid gland with no mass or nodule lesion. Histologically, diffuse proliferation of follicular epithelium was observed with preservation of normal structures. There were no malignant findings such as cellular atypia or invasion to capsule.
Keywords:cattle  enzootic bovine leukosis  Fukushima  goiter  Japanese black
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