This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Enterobecteriaceae, Subject name: Microbiology
Most common cause of traveller's diarrhea is - 
Select and explain. 
A. Enteropathogenic E. Coli, B. Enterotoxigenic E. Coli, C. Salmonella typhi, D. Shigella dysenteriae
B: Enterotoxigenic E. Coli
Answer: B: Enterotoxigenic E. Coli 
Explanation: Ans. is 'b' i.e., Enterotoxigenic E. Coli o Most common cause of traveller's diarrhea is Enterotoxigenic E. coli, followed by Enteroaggregative E. coli as 2nd most common cause.o Important causes of traveller's diarrhea are:-1) Bacteria: ETEC (most common), Enteroaggregative E. coli (2nd me), EIEC, shigella, salmonella, Campylobacter, V. cholerae.2) Viruses: Rotavirus, Norwalk like virus.3) Parasites: E. histolytica, Giardia lamblia, Cryptosporidium, Cyclospora.