Traveller's diarrhea is the most common but also the most predictable health problem that can occur during a trip?

Up to 70% of travelers every year, exhibiting symptoms of acute diarrhea during their trip. In most cases of traveler's diarrhea occurs during the first week of the trip and disappears within a few days without specific treatment. In any case and according to the intensity of the symptoms, it may be required:

• change travel schedule,
• staying in bed
• and occasionally hospitalization

while making a significant financial cost to both travelers themselves and in the countries of destination.

The factors that predispose to the occurrence of traveler's diarrhea is the same destination, the type and the origin of food or drink consumed and the degree of cooking or pasteurisation

Causes: 80% of traveler's diarrhea is due to enteropathogenic bacterial such as Escherichia coli & the Salmonella, but to a lesser % may be due to parasites, viruses, but also in non-infectious causes such as stress-related travel, jet-lag and change in eating habits (increased consumption of fats, spices and alcoholic beverages).

The presence of the normal flora in the gut is a major protective agent for the maintenance of health, acting competitively on pathogens and enhancing proper functioning of the immune system.