Abstract
A male-specific bacteriophage plaque assay was evaluated as a faecal contamination or process integrity indicator for aspects of the pork slaughter process. Over 400 samples were tested including: sponge swabs from animal hauling trailer floors and dressed carcass surfaces; faecal material; water from slaughter sites; and water from each stage of wastewater treatment. Bacteriophage were observed in wastewater, trailers, slaughter process water and swine faeces. No bacteriophage were observed on dressed carcasses. Numbers of phage plaque-forming units per gram or millilitre showed greater variation and were usually lower than standard indicators, including total coliform or Escherichia coli counts. Among the applications studied, male-specific bacteriophage appear to be best suited for process control verification for wastewater treatment.
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