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Paragraph 4

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In the case of category (b) above, if the results of tests on five consecutive samples show an incidence of samples which produce results above the lower threshold but at or below the upper threshold of above 2 in 5, in the case of Escherichia coli, or above 1 in 5, in the case of Staphylococcus aureus, the quality shall be considered unacceptable.