| a novel spiroplasma pathogen causing systemic infection in the crayfish procambarus clarkii (crustacea: decapod), in china. | a novel disease of crayfish procambarus clarkii appeared in the summer of 2004 in freshwater aquaculture in jiangsu province of china. light and transmission electron microscopy (tem), molecular biological methods and in vitro culture were used to identify the pathogen. the agent was unique in having a helical morphology and rotary motility as observed by phase-contrast light microscopy and was found in haemolymph, muscles, nerves and connective tissues by smear method and tem. ultra-thin sectio ... | 2005 | 16000238 |