Travelers' Diarrhea Patient Information Fact Sheet
What is travelers' diarrhea?
Travelers' diarrhea is, as the name suggests, a diarrheal condition most often experienced while traveling. It is more likely to occur in less developed countries in Africa, Asia and Central and South America, but can also occur in developed countries. In most cases, travelers' diarrhea is fairly mild and does not last very long. It is not usually severe or life-threatening. However, it can be dangerous in very young children or babies who may become dehydrated within a few hours if the diarrhea is severe, especially if the diarrhea is accompanied by vomiting. It may also be dangerous in the elderly or in people already weakened by another illness.
In most cases the diarrhea resolves without treatment. However, in more serious cases where the diarrhea is caused by infection with a specific organism treatment may be required. “Gastroenteritis” is the term used to describe any infections that cause diarrhea.
For most healthy travelers, diarrhea is a nuisance and uncomfortable, but is rarely a serious health problem. However, for malnourished children in developing countries diarrhea can often be life-threatening and many die each year as a result of severe dehydration.
What are the symptoms of travelers' diarrhea?
In most cases, the diarrhea, often accompanied by griping abdominal pain, will last 1 or 2 days. If it continues for more than 3 days, or for more than 1 day in a baby, seek medical attention. If there is blood in the diarrhea or a high temperature (fever) is also present, the cause could be more serious.
What different types of organisms are responsible for travelers' diarrhea?
In 80-90% of cases, travelers' diarrhea is caused by bacterial pathogens. Most cases are mild and last only a few days. However, certain strains of the bacterium, such as E. coli 0157: H, can potentially cause a very serious, even life-threatening infection. Symptoms include severe, bloody diarrhea and abdominal cramps. This can be followed by serious organ system damage such as kidney failure. You may be exposed to E. coli from contaminated water or food — especially raw vegetables and undercooked ground beef. While healthy adults usually recover from an E. coli O157:H7 infection with within a week, more vulnerable populations, such as young children and older adults, can develop a life-threatening form of kidney failure called hemolytic uremic syndrome (HUS).
There are many other causes of diarrhea, which tend to occur in less developed countries. Shigella is another bacterium, which is identified as the cause in around 15% of diarrheal illnesses. Initially, the infection causes profuse, watery diarrhea and a high temperature. The symptoms then develop into loose, frequent stools containing blood and mucus that can last for up to a month. The illness can be very unpleasant, particularly for children, and requires treatment with antibiotics.
Salmonella is also a bacterium that is responsible for some cases of diarrhea. The symptoms usually last about a week and are limited to mild to moderate diarrhea that contain mucus but rarely any blood.
Typhoid is similar to salmonella infection and is a serious illness that can be fatal if not treated. Typhoid and rotaviruses can cause more severe diarrhea in children than in adults.
Giardia lamblia is an intestinal parasite that accounts for many of the cases of persistent diarrhea brought home by travelers. The early phase can vary from a mild condition to a very unpleasant, profuse, watery diarrhea. If untreated, it can lead to vitamin deficiencies. The second, chronic phase can persist for months or even years and is characterized by bulky, extremely foul-smelling, pale grey stools due to unabsorbed food.