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Comparison of bioaccumulation and elimination of Escherichia coli and male-specific bacteriophages by ascidians and bivalves.
Levels of Escherichia coli and male-specific bacteriophages (MSBs) were determined in the filter feeders obtained from retail markets, commercial farms, and wild beds in Korea. The accumulation and elimination of E. coli and MSBs were compared between ascidians and bivalves (oysters and mussels) during relaying and depuration. E. coli concentrations in ascidians from retail markets ranged between < 20 and 460 most probable number/100 g while MSBs were not detected. E. coli levels in bivalves from commercial farms and wild beds were not significantly different but bacterial levels in ascidians were consistently lower. Ascidians exhibited much lower ability than bivalves to accumulate E. coli and MSBs during relaying in a polluted coastal area. This study also shows that an equilibrium was developed between levels of microbes in water and ascidians and shellfish during relaying. E. coli and MSBs in ascidians decreased quickly during depuration in a clean seawater tank. However, after 1 day, E. coli in bivalves decreased by only 1.1-1.6 logs, and the elimination of MSBs was negligible. Therefore, depuration is an effective means to reduce the health risk of contaminated ascidians.
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