Optical and Transmission Electron Microscope Study on Nerve Tissue Infested by Rickettsia-like Organisms in Crab,Eriocheir sinensis,Suffering from Tremor Disease

An optical and transmission electron microscope study on nerve tissue of thoracic ganglion and muscles in the crab,Eriocheir sinensis which suffering from tremor disease,indicated that rickettsia-like organisms (RLO) infested in glial cells,connective tissue and intercellular space.In the connection between nerve and muscle fibers-motor end-plate,there were also a lot of RLOs in groups,just like the way in the nerve tissue.Thoracic ganglion is a nerve plexus controlling the moving of periopods.The fact that RLO infested this tissue and the motor end-plate verifies that RLO closely relates to the tremor disease,which main disorder is paroxysmal tremor of the periopods.This is firmly confirmed that RLO is a pathogenic parasite of the tremor disease.