TTU Food Sanitation Exam 1 Practice Test

Traveler's diarrhea is most commonly caused by Enterotoxigenic E. coli (ETEC). This strain sticks to the small intestine and releases toxins that disrupt normal fluid balance, producing a profuse, watery (secretory) diarrhea. The toxins—heat-labile and heat-stable—raise levels of cAMP and cGMP, which drives intestinal secretion and results in the characteristic watery stools after travel, especially in areas with contaminated food or water. Prevention hinges on good hygiene and safe drinking water or treated water while traveling. Other E. coli types cause different illness patterns, which helps distinguish them. Enteroinvasive E. coli (EIEC) invades the intestinal lining and causes dysentery-like diarrhea with fever and blood in stool. Enteropathogenic E. coli (EPEC) is a major cause of infant diarrhea and uses attaching-and-effacing mechanisms to disrupt the gut lining. Enterohemorrhagic E. coli (EHEC) produces Shiga-like toxins leading to severe cramps, sometimes bloody diarrhea, and can cause serious complications like hemolytic uremic syndrome, often linked to undercooked beef or contaminated produce.