Question 16 · LDEK · Environmental epidemiology

Coliform index means:

  1. A. smallest volume of water in cm³ containing at least one bacterial cell of the coli group.
  2. B. total number of colon bacilli Escherichia coli occurring in 1 dm³ of a tested water sample.
  3. C. total number of psychrophilic bacteria.
  4. D. total number of mesophilic bacteria.
  5. E. ratio of the number of psychrophilic bacteria to the number of mesophilic bacteria.
Hint

Distinguish the coli index from the coli titre: one is a count per volume, the other is the smallest volume containing a bacterium.

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