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The Rickettsia-like organism (RLO) in the enteric epi thelium of the diseased Pagrosomus major [Temmincket Schlegel] were observ ed with electron microscopy. 运用电镜技术对青岛地区患病真鲷进行了病原体检测，在肠上皮组织细胞中发现一种类立克次体病原体。