英语语法分析

Rickettsia is a bacterium which can cause many diseases that are transmitted by blood-sucking parasitic arthropods.

立克次氏体是一种细菌，这种细菌可引起多种疾病，并通过吸血节肢寄生动物传播。

It is caused by Rickettsia rickettsii and spread by ticks of the genus Dermacentor.

它由立克次氏体引起，由革蜱属的蜱类传播。

Rickettsia - like organism was an important pathogen which caused the fish disease.

类立克次体是导致鱼类病害的重要病原体。