These pathogens colonise the gut of the traveller, who does not have the immune defences required to fight them. That’s because travel can affect the body’s normal defence mechanisms due to stress, time differences, unfamiliar foods, water, etc. The protective bacteria usually present in the gut will be disrupted and can no longer prevent enteropathogens from adhering to its wall, changing the intestinal physiology and causing dysbiosis.
The main symptoms of traveller’s diarrhoea are liquid stools, stomach cramps, nausea or vomiting and fever. Although they are not usually dangerous, they can have serious repercussions, such as dehydration, in children, the elderly, or people who are already weak or immunocompromised.