关键词: 分裂相, 小刺, 附着

Abstract: The transmission electron microscopy had been used to visualize the three types of pathogens from the hindgut of the cockroach, Periplaneta fulginosa, The three pathegens were designatd ball shape, short curverods and large rod.At specific areas of the hindgut,pathogens attached to spine-like projections.The short rods had been obsarved to under go fission,Some pathogens invated into submucous membrane of tho gut. The cockroaches transmit ted pathogens with biological mechanism.