Detection of Enteroviruses and Bacterial Indicators and Pathogens in Louisiana Oysters and Their Overlying Waters

Abstract

Field studies were conducted for 1 year to determine levels of enteroviruses in Louisiana Gulf Coast oysters and their overlying waters. Levels of human enteric viruses were compared with bacterial pathogens (Salmonella and Vibrio parahaemolyticus), fecal coliform levels, and physicochemical water parameters (pH, salinity, temperature, and conductivity). Samples of 20–30 oysters and 380 L of overlying water were collected monthly from both “open” and “closed” oyster growing areas. Enteric viruses were found predominantly in January and February. Viruses were isolated only from areas which exceeded the 14 fecal coliforms/100 ml standard for shellfish harvesting waters.