Which Enterobacteriaceae is most commonly associated with traveler's diarrhea?

Which Enterobacteriaceae is most commonly associated with traveler's diarrhea?

• A. Salmonella enterica
• B. Shigella dysenteriae
• C. Enterotoxigenic Escherichia coli (ETEC)
• D. Klebsiella oxytoca

Answer: (C)

Enterotoxigenic Escherichia coli (ETEC) is the primary pathogen linked to traveler's diarrhea, primarily affecting those who travel to areas with poor sanitation. ETEC produces enterotoxins that provoke watery diarrhea, a hallmark symptom of this type of gastroenteritis. This bacterium is often contracted through contaminated food or water, making it particularly relevant to individuals who travel to regions where hygiene practices may be inadequate. In contrast, while other pathogens such as Salmonella enterica and Shigella dysenteriae can cause diarrhea, they are not the leading causes associated with traveler's diarrhea. Salmonella typically leads to more severe gastrointestinal symptoms and is often linked to undercooked poultry or contaminated foods, while Shigella tends to cause bloody diarrhea and can be associated with person-to-person spread in overcrowded conditions. Klebsiella oxytoca, on the other hand, is less commonly associated with gastrointestinal illnesses in travelers, as it is more often implicated in nosocomial infections and other non-diarrheal conditions. Thus, ETEC's specificity to traveler's diarrhea, due to its production of toxins and the context in which it is transmitted, firmly establishes it as the correct choice in this scenario.

Enterotoxigenic Escherichia coli (ETEC) is the primary pathogen linked to traveler's diarrhea, primarily affecting those who travel to areas with poor sanitation. ETEC produces enterotoxins that provoke watery diarrhea, a hallmark symptom of this type of gastroenteritis. This bacterium is often contracted through contaminated food or water, making it particularly relevant to individuals who travel to regions where hygiene practices may be inadequate.

In contrast, while other pathogens such as Salmonella enterica and Shigella dysenteriae can cause diarrhea, they are not the leading causes associated with traveler's diarrhea. Salmonella typically leads to more severe gastrointestinal symptoms and is often linked to undercooked poultry or contaminated foods, while Shigella tends to cause bloody diarrhea and can be associated with person-to-person spread in overcrowded conditions. Klebsiella oxytoca, on the other hand, is less commonly associated with gastrointestinal illnesses in travelers, as it is more often implicated in nosocomial infections and other non-diarrheal conditions.

Thus, ETEC's specificity to traveler's diarrhea, due to its production of toxins and the context in which it is transmitted, firmly establishes it as the correct choice in this scenario.