Abstract

Chlamydia-like organisms have been detected in digestive cells and duct cells of the digestive gland of mussels, Mytilus galloprovincialis, collected from the Basque coast. The organisms appeared as basophilic inclusion bodies within digestive cells and consisted of elongate initial reticulate bodies and previously undescribed condensed forms, interpreted as intermediate bodies. Of the 414 mussels examined by light microscopy, 5.31% showed this type of infection. A second type of chlamydia-like organism was found in nonciliated duct cells. The microorganisms were found mostly free in duct cells and large elongate reticulate bodies, intermediate condensing forms, and fully condensed elementary bodies were clearly distinguished. No serious histopathological or ultrastructural changes were observed in host cells but evidences of a possible localized metabolic damage within infected digestive cells is presented.

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