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Mikrocytosis, United States

Impact Worksheet, July 30, 2002`

Document format: pdf

Publisher: U.S. Department of Agriculture

Creation date: July 30, 2002

The first identification of Mikrocytos mackini in the US has been made in feral Pacific oysters in waters of the Dungeness Bay in the western part of the state of Washington. Mikrocytosis is a disease of 4 species of oysters caused by the parasite, Mikrocytos mackini. Mikrocytosis is known to occur along Canada?s west coast. The impact of mikrocytosis on the domestic oyster industry is not likely to be significant because: it typically occurs in oysters older than the age at commercial harvest; it has been found only in feral oysters and not farmed oysters; it is not contagious to humans; and movement or harvest of shellfish from waters of the Dungeness Bay was already prohibited because of high fecal coliforms and paralytic shellfish poisoning.

Key Words: Mikrocytosis • USDA • Disease