Yanagawa disease
(bracken poisoning in horse)

This name was given because this disease occurred in a stock farm in the Yanagawa district to the east of Morioka City. Yanagawa disease is vitamin B1 deficiency so-called "bracken poisoning" due to ingestion of bracken that thickly grows in late autumn in the pasturage in this district. The primary sign is paralysis of the hindquarters, and bleeding and degeneration are observed in the entire body especially in the peripheral nerves of the pelvic limbs and fore limbs (register No. 5035)

Masanobu Goryo
Address inquiries to the following.

Department of Veterinary Pathology, Faculty of Agriculture, Iwate University., Morioka, 020-8550, Japan