![]() ![]() The organisms exhibit clearly recognizable ultrastructural characteristics of prokaryotic bacteria-like cells, including two trilaminar membranes, an increasing electron-dense periplasmic ribosome zone, and a thread-like DNA nucleoidal structure. These organisms are extremely pleiomorphic in shape and average 967 x 551 nm in size, as measured in cross sections of transmission electron micrographs. This organism parasitizes the cytoplasm of host cells and forms intracytoplasmic eosinophilic inclusions. The present paper reports for the first time the discovery of a rickettsia-like organism (RLO) in the cultured tropical marine pearl oyster Pinctada maxima with mass mortality in the Hainan Province of China.
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