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应用电镜超薄切片技术，在患有“狂游症”的欧鳗脑细胞中发现一种弹状病毒，该病毒颗粒只存在于细胞浆中，大小约50－80nm×100-250nm，具有囊膜，囊膜外附有纤突，可造成宿主细胞肿胀和空泡变性等病理变化，它是欧鳗“狂游症”的主要病原体。
Using electron microscopy ultrathin section technique, a rhabdovirus was found in the European eel brain cells suffering from “wandering disease”. The virus particle only exists in the cytoplasm and has a size of about 50-80nm × 100-250nm. Membrane, capsule attached to the fiber process, can cause host cell swelling and vacuolar degeneration and other pathological changes, it is the European eel “Madover disease” the main pathogen.