KROK 1 2017 – Question 4 · KROK (Medicine) · Microbiology, Virology, and Immunology
During sanitary and bacteriological testing of water with the membrane filter technique there were revealed two red colonies on the membrane filter (Endo medium) through which 500 ml of water was filtered. Calculate the coli index and coli titer of this water:
- A. 250 and 2
- B. 4 and 250
- C. 2 and 500
- D. 250 and 4
- E. 500 and 2
Hint
Scale the colony count to the volume used in the definition of the coli index, and note that the coli titer is its inverse expressed as a volume.
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