KROK 1 2009 – Question 10 · KROK (Medicine) · Microbiology, Virology, and Immunology
Sanitary bacteriological research on water by the membrane filter method revealed two red colonies on a membrane filter (Endo agar) through which 500 ml of analyzed water were passed. Calculate the coli index and coli titer of the analyzed water:
- A. 500 and 2
- B. 4 and 250
- C. 250 and 2
- D. 2 and 500
- E. 250 and 4
Hint
Remember that the coli index is the number of E. coli per litre, the coli titer is the volume holding one cell, and each colony stands for one cell.
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