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Results

MPN tests

In the presumptive test all lactose broth tubes had more then 10% gas in their Durhams's tubes (See table X). This translates to a reference number of 3-3-3 (three positive results from each concentration of initial sample. The provided MPN lookup table does not include an entry for this result, however the result for 3-3-2 is 1100 / 100mL. The result of the presumptive test is thus taken to be grater then 1100 / mL