The Vibrio cholerae O1 El Tor biotype is distinguished from the classical biotype by being positive for which test?
- A Voges-Proskauer test ✓
- B Cholera Red reaction
- C String test
- D Oxidase test
Correct answer: A. Voges-Proskauer test
Explanation
The El Tor biotype of Vibrio cholerae O1 is distinguished from the classical biotype by being Voges-Proskauer (VP) positive (produces acetylmethylcarbinol from glucose fermentation), resistant to polymyxin B, and hemagglutinating to chicken RBCs. El Tor has replaced the classical biotype globally since the 7th pandemic. Both biotypes are oxidase-positive and cholera red reaction positive.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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