some people are more susceptible than others: it's not clear why that is. you can be with a group and all consume the same thing and some get sick while others do not. there are a host factors involved. stomach acid is our first defense mechanism against organisms that we ingest. therefore those on antacids or who just have low stomach acid often get travelers' diarrhea more easily. people who have underlying diseases of the gut such as crohn’s disease or aids may be more susceptible to certain types of organisms causing travelers’ diarrhea.
who is most likely to get travelers' diarrhea?