Introduction 

Traveler's diarrhoea is a common condition affecting individuals, especially those travelling from developed to developing regions. It affects approximately 40 to 60 percent of travellers. It is characterised by three or more loose stools in 24 hours, often accompanied by cramping, nausea, and vomiting.¹ In this article, you will learn about Traveler's diarrhoea, including its causes, risk factors, symptoms, diagnostic techniques, treatment options, and preventive measures.

Overview of Traveler's diarrhoea

Traveler's diarrhoea is a gastrointestinal infection caused by consuming contaminated food or water. The most common pathogens that cause this infection include bacteria ( such as Escherichia coli, Campylobacter jejuni, Shigella, and Salmonella species), viruses ( such as Norovirus and rotavirus) and parasites such as Giardia intestinalis. Among these, bacteria accounts for nearly 30% of cases.¹

The incubation period varies depending on the cause. Viruses and bacteria usually cause symptoms within 6 to 24 hours, whereas intestinal parasites may take between 1 and 3 weeks to manifest.

Symptoms of traveler’s diarrhoea usually appear within 1 to 2 weeks of arriving in a resource-limited area but can develop at any point during the trip or shortly after returning. These include:¹

• Frequent loose stools (≥3 in 24 hours)
• Abdominal cramping
• Fever
• Nausea
• Vomiting
• Blood in stool
• Severe abdominal pain
• Dehydration
• Tachycardia
• Hypotension 

Risk factors for Traveler’s diarrhoea 

The various risk factors for Traveler’s diarrhoea include:¹

High-risk regions for Traveler's diarrhoea

Traveler's diarrhoea can occur anywhere globally. However, certain regions pose a higher risk. Traveler’s diarrhoea affects between 30% and 60% of individuals visiting areas with limited resources. The incidence rate and the causative agents vary by destination, with sub-Saharan Africa reporting the highest cases. Other high-risk regions include Latin America, the Middle East, and South Asia.

Poor hygiene practices

Regions with poor sanitation and hygiene pose a higher risk. The primary contributor to traveller’s diarrhoea is poor hygiene practices, particularly in food handling, preparation, and storage. Insufficient refrigeration due to unstable electricity and improper food storage further increase the risk. Additionally, consuming unsafe water also causes the infection.

Weather conditions

It is most prevalent in warmer climates, where the temperature is favourable for the growth of bacteria and other pathogens.

Other factors

Certain modifiable factors also elevate the risk, such as the use of proton pump inhibitors (PPIs), recent antibiotic use, and engaging in unsafe sexual activities. Additionally, some individuals are more vulnerable to severe complications, including pregnant travellers, young children, the elderly, those with chronic gastrointestinal disorders, and immunocompromised individuals.

Diagnosis

Laboratory testing is usually unnecessary for most cases of traveller’s diarrhoea. However, patients with severe symptoms may require testing. Various diagnostic methods include:¹

Laboratory tests

• Indicated for patients with:
  • High fever
  • Bloody stools (hematochezia)
  • Tenesmus (painful bowel movements)
• Common stool studies:
  • Stool culture
  • Fecal leukocytes
  • Lactoferrin
  • Ova and parasite testing for prolonged symptoms
• Multiplex PCR tests:
  • Rapid pathogen detection
  • Expensive and not widely available
  • May not significantly change treatment approach

Imaging (Only in severe cases)

• X-ray (Kidneys, Ureters, Bladder): To assess intra-abdominal pathology or perforation
• Abdominal CT scan: For further evaluation of intra-abdominal complications

Treatment and management

Various treatment methods include:¹

Hydration and fluid replacement

• For mild cases, increase water intake; electrolyte fluids can be used
• For children use Pedialyte for fluid replenishment
• Avoid Milk and fruit juices (they may worsen diarrhoea)
• For moderate to severe cases, use oral rehydration salts (ORS)
• Severe dehydration: IV fluids may be required 

Symptom relief

Loperamide (anti-diarrheal) can be used if there are no signs of inflammatory diarrhoea. Dosage for adults is 4 mg initially, then 2 mg after each loose stool (maximum 16 mg per day).

Antibiotic treatment (Taken at symptom onset)

• Ciprofloxacin: Commonly used but has Campylobacter resistance concerns
• Azithromycin: Preferred for travellers to Asia, pregnant travellers, and children. The dosage is 500 mg daily for 3 days. For paediatric use, azithromycin powder can be mixed with water as needed
• Rifaximin: A minimally absorbed antibiotic, safe for older children and pregnant travellers 

Differential diagnosis

Differential Diagnosis of travellers’ diarrhoea include:¹

• Pseudomembranous colitis
• Ischemic colitis
• Vipoma
• Radiation-induced colitis
• Food poisoning 

Prophylaxis

Prophylactic measures include:¹

• Routine use of prophylactic antibiotics is not recommended
• Antibiotic prophylaxis may be considered for high-risk individuals (e.g., immunocompromised travellers)
• Bismuth subsalicylate can be taken to reduce the risk of traveller’s diarrhoea
• Rifaximin is the preferred antibiotic for prophylaxis if needed
• Fluoroquinolones are not advised

Preventive measures

Preventive measures include:¹

• Stay hydrated with water or electrolyte solutions, e.g. ORS
• If diarrhoea persists for more than 10 days, seek medical attention
• Follow up with a clinician if symptoms worsen or if signs of severe dehydration occur

• Wash hands frequently with soap and water or use hand sanitiser
• Maintain good personal hygiene to prevent infections
• Avoid consuming shellfish from contaminated waters
• Wash all fruits and vegetables before consumption
• Drink only bottled, boiled, or properly treated water
• Avoid tap water, ice from street vendors, and water from lakes or rivers
• Prefer dry foods and carbonated beverages while traveling
• Avoid street food, especially uncooked or improperly stored items

FAQs

Is traveler’s diarrhea contagious?

Yes, it can spread from person to person through contaminated hands, food, or water.

Can traveler’s diarrhea resolve on its own without treatment?

Yes, most mild cases are self-limiting and improve with hydration and rest.

Can brushing teeth with tap water cause traveler’s diarrhea?

Yes, if the tap water is contaminated, it can introduce pathogens into your system.

 Can using antibiotics frequently increase the risk of traveler’s diarrhea?

Yes, the overuse of antibiotics can alter gut flora and increase susceptibility to infections like C. difficile.

Can children take antibiotics for traveler’s diarrhea?

Yes, azithromycin is often used.

Summary

Traveler’s diarrhea remains one of the most common health concerns for individuals visiting resource-limited destinations. It is primarily caused by bacterial, viral, or parasitic pathogens, with incidence rates ranging from 30% to 60%, depending on the area. Warmer climates, poor sanitation, and inadequate food and water safety increase the risk of infection. Symptoms typically include frequent loose stools, abdominal cramping, nausea, vomiting, fever, and, in severe cases, dehydration and bloody stools. While most cases are self-limiting and resolve within a few days, certain groups, including children, pregnant women, immunocompromised individuals, and those with gastrointestinal disorders, are at higher risk of complications. Diagnosis is often clinical, but stool testing is required for persistent or severe cases. Treatment focuses on maintaining hydration with oral rehydration solutions or IV fluids for severe dehydration. Antibiotics such as rifaximin are advised for moderate to severe cases, while fluoroquinolones are usually avoided. Prevention remains key, emphasising hand hygiene, safe food and water practices, and the use of bismuth subsalicylate as prophylaxis. The future of traveler’s diarrhoea management lies in improved public health initiatives, better food handling education, and the development of rapid diagnostic tools. While antibiotic prophylaxis is not generally recommended, high-risk travellers may benefit from this preventive measure. As global travel increases, raising awareness and promoting effective preventive measures is essential in reducing the incidence of traveler’s diarrhoea and ensuring safer journeys for people worldwide.