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When tested in phosphate buffer at pH 7·0, strains of Staphylococcus aureus isolated from turkeys immediately after commercial slaughter were reduced in viability by at least 10000‐fold following exposure to 1 mg/1 of free available chlorine for 2 min at 20°C. In contrast, corresponding isolates from samples taken later in the process, and apparently derived from strains capable of colonizing processing equipment (‘endemic’ strains), were reduced only ca 100‐fold; some of these strains survived treatment with 2 mg/1 of free chlorine, when tested under the same conditions. The greater resistance of ‘endemic’ strains to chlorine may contribute to their persistence in the processing plant.
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Mead et al. (1986) studied this question.
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