<prompt> Most common strain of E.coli giving rise to travellers diarrhea is ?Entero-invasive E.coli EICEEntero-pathogenic E.coli EPECEntero-toxigenic E.coli ETECEntero-aggregative E.coli EAEC  <response>: Ans. is c i.e., Entero-toxigenic E.coli Entero-toxigenic E.coli is the most common cause of travellers diarrhea. Other organisms causing travellers diarrhea are: Enteroaggregative E.coli - Vibrio cholerae Shigella - Rotavirus and Norwalk-like virus Salmonella - Entamoeba histolytica Compylobacter-jejuni - Giardia lamblia Aeromonas - Cryptosporidium Plesiomonas - Cyclospora 