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Blastocystis sp., is an anaerobic unicellular microorganism frequently found in the gastrointestinal tract of humans and of a wide gamma species of vertebrate and invertebrate animals. However, its presence in oysters has not been reported, and if the consumption of oysters infected with Blastocystis sp. it is a way of acquiring the infection for humans. The objective of this study was to determine by light microscopic analysis the presence of Blastocystis sp in oysters Crassostrea virginica (C. virginica) sold for human consumption in markets in Mexico City. 500 oysters were obtained. The intestine of each oyster was dissected and the faecal material was examined. The faeces were examined by light microscopic. 77% were infected with cysts of Blastocystis sp. Eaten raw, these oysters are a possibility source of infection for humans.

Identification by Light Microscopy of Blastocystis Sp. in Oysters Crassotrea Virginica