Question

Diarrhoea is caused by which of the following species?

• A. Enterobacter cloacae
• B. Escherichia coli
• C. Pemphigus vulgaris
• D. Yersinia pestis

Hint:

ETEC = Traveller’s diarrhoea, EHEC = bloody diarrhoea, EPEC = infantile diarrhoea.

Answer 1

The Correct Option is B

Step 1: Recall diarrhoeal pathogens.
The major bacterial causes of diarrhoea include E. coli (ETEC, EHEC, EPEC), Vibrio cholerae, Shigella, and Salmonella.
Step 2: Analyze given options.
- (A) Enterobacter cloacae: Usually opportunistic pathogen, rarely diarrhoea.
- (B) Escherichia coli: Enterotoxigenic and enterohemorrhagic strains cause diarrhoea. Correct.
- (C) Pemphigus vulgaris: Not a bacteria, it is an autoimmune blistering disorder.
- (D) Yersinia pestis: Causes plague, not diarrhoea.
Step 3: Conclusion.
The correct answer is Escherichia coli.