The most important causes of traveler’s diarrhea occurring in developing regions are: ETEC, enteroaggregative E coli, diffusely adherent Ecoli,noroviruses, rotavirus,Salmonellaspecies,Campylobacterjejuni, Shigella species, Aeromonas species, Plesiomonas shigelloides, enterotoxigenic Bacteroides fragilis, and Vibrio species