Vibrio parahaemolyticus are common causes of diarrhoeal disease worldwide. These marine micro-organisms, native in estuarine waters globally, concentrate in the gut of filter-feeding molluscan shellfish, such as oysters, clams and mussels. This volume considers the applicability of an assessment of the public health impact of raw oysters consumption, developed in one country, to assess the public health risk associated with the consumption pf raw oysters harvested in other countries where different growing and harvesting scenarios might exist. This publication and others in this series contain information that is useful to both risk assessors and risk managers, including international scientific committees, governments and food regulatory agencies, food producers and industries and other people or institutions with an interest in the area of microbiological hazards in food and their impact on human health.