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Q: Which of the following statements is INCORRECT?
  • A. Chick Martin test uses organic matter in media
  • B. The organism in Rideal-Walker test is S. typhi
  • C. Rideal-Walker test uses organic matter in media
  • D. The organism in Chick Martin test is S.typhi
Correct Answer: Option C - In Rideal-Walker method, test is carried out in water, while in Chick-Martin test the disinfectants are made to act in the presence of organic matter. (yeast or 3% of dried human feces)
C. In Rideal-Walker method, test is carried out in water, while in Chick-Martin test the disinfectants are made to act in the presence of organic matter. (yeast or 3% of dried human feces)

Explanations:

In Rideal-Walker method, test is carried out in water, while in Chick-Martin test the disinfectants are made to act in the presence of organic matter. (yeast or 3% of dried human feces)