Procedures to enumerate commonly used bacteriophage tracers in bivalve molluscan shellfish were evaluated. Bacteriophages specific to Serratia marcescens, Escherichia coli and Enterobacter cloacae can be recovered from shellfish flesh by chloroform treatment of homogenates and subsequent clarification of samples by centrifugation. Bacteriophages were enumerated using a soft agar overlay technique. Hard clams appeared to release toxic compounds during homogenization which dramatically reduced counts of Ent. clocae bacteriophage.
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