Fusobacterium necrophorumは現在F.necrophorum subsp. necrophorumとF.necrophorom subsp. funduliformの2亜種に分類され,前者が病原性が強いとされている.しかし,後者も病巣から分離されることが報告されている.そこで,肝膿瘍以外の牛病巣由来 Fusobacterium necrohoprumの保存菌株23株の亜種の同定を行ったところ,F.necrophorum subsp. necrophorumが9株,F.necrophorum subsp.funduliformeが14株であった.今後,F.necrophorum subsp.funduliformeの病巣における分布と感染に関与する他の菌についての研究が必要であろう.
Of the two subspecies into which Fusobacterium necrophorum is classified, F. necrophorum subsp. Necrophorum is more pathogenic than F. necrophorum subsp. funduliforme. We determined the subspecies of 23 strains of F. necrophorum isolated from bovine lesions other than liver lesions and stocked in our laboratory. Of them 9 stains were identified as F. necrophorum subsp. necrophorum and the remaining 14 as F. necrophorum subsp. funduliforme. Further study of the distributions of F. necrophorum subsp. funduliforme in lesions and of other bacteria associated with infections may be necessary.