Neuropathological Observation of Rabbits (Oryctolagus cuniculus) Affected with Raccoon Roundworm (Baylisascaris procyonis) Larva Migrans in Japan

Journal of Veterinary Medical Science

Haruo KAMIYA¹  Takane MATSUI²  Shigeo OWAKI²  Hiroshi SATO¹  Midori KUBO²  Yoshiyasu KOBAYASHI²  Hidefumi FURUOKA² 

[1]Department of Parasitology, Hirosaki University School of Medicine

[2]Department of Pathobiological Science, Obihiro University of Agriculture and Veterinary Medicine

关键词: Baylisascaris procyonis;    larva migran;    neuropathology;    rabbit;    raccoon;   

DOI  :  10.1292/jvms.65.695

学科分类：兽医学

来源: Japanese Society of Veterinary Science

【 摘 要 】

References(22)Cited-By(7)Larvae of the raccoon roundworm, Baylisascaris procyonis (B. procyonis) are a known cause of cerebrospinal larva migrans in animals and humans. The present paper described details of the central nervous lesion in the rabbits (Oryctolagus cuniculus) affected with B. procyonis larva migrans in Japan. Clinically affected animals showed neurological signs including circling, torticollis, tremor of head, or ataxic gait. The most characteristic pathological alterations were large malacic lesions associated with an activated astroglial proliferation which was seen at the corpus medullare in the cerebellum including the cerebellar peduncle. Moreover, focal malacic lesions with perivascular cuffing and infiltration by lymphocytes and heterophiles were scattered everywhere throughout the brain. In these lesions or normal-appearing areas away from obvious lesions, ascarid larvae, about a maximum 65-75 μm in diameter, were recognized. Other prominent features were minute lesions (we call them migration tract-like lesions) composed of lymphocytes, hemosiderin-laden macrophages and reactive astrocytes scattering throughout the cerebrum. In this study, we demonstrated ascarid larvae in only eight out of 23 animals diagnosed as B. procyonis larva migrans. Since it is not always possible to detect the larvae, the possibility of B. procyonis larva migrans must be given serious consideration to the characteristic lesions described above.

【 授权许可】

Unknown