Abstract
The most probable number (MPN) method of enumerating bacteria from environmental samples is widely used; however, it requires (i) that only certain numbers of tubes per dilution level be employed and (ii) a table of MPN values by which the resulting MPN codes may be evaluated. A rapid method for the estimation of MPN, regardless of the number of tubes per dilution level, applicable to unsophisticated hand-held calculators is presented.

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