Every December, large numbers of people move across States and countries for holidays, study, work, and pilgrimages. This flow of travellers forms a significant part of the global tourism economy, which recorded more than 1.4 billion international journeys in 2024. India is now among the major contributors to this movement, with a steady increase in outbound travel and a corresponding rise in domestic mobility.
The movement of people has always influenced the movement of disease. The SARS outbreak in the early 2000s showed how infections can spread across borders through air travel. COVID-19 reinforced this pattern on a global scale. Both events highlighted the importance of understanding health risks associated with travel and the systems necessary to manage them.
What is emporiatrics?
Traveller’s health, known as emporiatrics, studies the health needs of people who travel. The field examines how diseases spread across regions, how environmental changes affect risk, and how travellers can reduce illness through preparation. It also helps countries plan entry requirements to prevent the introduction of infections. The discipline developed historically in response to the needs of long-distance traders and seafarers, who frequently encountered unfamiliar illnesses. Today, it covers routine vaccines, destination-specific risks, climate-related concerns, altitude effects, food and water safety, and post-travel symptoms.
Patterns in travel illnesses
Patterns of illness during travel depend on sanitation levels, climate, altitude, and exposure to vectors or animals. Traveller’s diarrhoea remains common in regions with inconsistent water quality. Mosquito-borne illnesses such as dengue, malaria, chikungunya, Zika, and yellow fever remain significant in tropical areas. Respiratory infections, including influenza and coronavirus, spread more easily in crowded transit spaces.
Illness can also arise from environmental conditions, such as air pollution. Travellers to high-altitude locations may develop acute mountain sickness if ascent is rapid. Heat stress affects travellers in desert regions and tropical climates. Contact with animals poses a risk of rabies and other zoonotic infections. These patterns underscore the importance of pre-travel planning.
Before travel
The World Health Organization (WHO) recommends that travellers begin preparations 4–8 weeks before departure. This includes gathering information on destination-specific risks, local laws, and customs. A pre-travel consultation allows a review of vaccinations, malaria prophylaxis where required, and food and water precautions. The guidance stresses that infants, pregnant women, older individuals, people with disabilities, and those with chronic illnesses seek specialist advice. Travellers are advised to carry their medicines in the original packaging and, for certain prescriptions, a letter from a physician on an official letterhead should be carried, as some countries treat the possession of specific drugs without documentation as a criminal offence.
Travel health insurance is described as essential, especially because treatment abroad may only be available through private providers, and repatriation can be costly. Many countries require proof of adequate insurance as part of their entry rules. The WHO also emphasises the importance of a basic medical kit, which should contain wound dressings, pain relievers, oral rehydration salts, thermometers, repellents, and other essential items, particularly for travel to areas where medical supplies may be limited.
During travel
The WHO advises travellers to carry physical and digital copies of their vaccination certificates, insurance documents, and prescriptions. The guidance stresses avoiding unsafe environments, excessive alcohol use, recreational drug use, and risky behaviours that increase exposure to sexually transmitted infections. Food and water safety remain important during travel. Bottled or filtered water is preferred in settings where the quality of the water is uncertain. Care with raw foods and street foods reduces the risk of gastrointestinal illness. Protection against mosquito bites through the use of repellents, clothing, and screened accommodation reduces vector exposure. Travellers to high altitudes require a gradual ascent, while those visiting hot climates need to stay adequately hydrated and take precautions to protect themselves from heat-related risks.
Vaccines and protections
Vaccination plays a crucial role in travel preparation. For Indian travellers, requirements vary by destination. Yellow fever vaccination is mandated in many African and South American countries. India issues the International Certificate of Vaccination through authorised centres. Saudi Arabia requires the quadrivalent meningococcal vaccine for Hajj and Umrah pilgrims. Some countries require proof of polio vaccination from travellers arriving from regions with a history of poliovirus transmission.
Other recommended vaccines depend on travel conditions. Hepatitis A and B vaccines are advised for regions with varying sanitation practices. Typhoid vaccination is suggested when exposure to contaminated food or water is likely. Rabies pre-exposure prophylaxis is recommended for individuals planning long-term travel or activities that involve close contact with animals. Influenza vaccination is useful during seasonal peaks. Alongside vaccination, travellers may require malaria chemoprophylaxis depending on the destination.
Countries set entry rules based on their public health priorities. The United States and the United Kingdom require routine immunisation for long-term visas and may mandate tuberculosis screening for specific categories of applicants. Gulf countries conduct medical fitness tests for employment visas and may screen for infections such as HIV, hepatitis, and tuberculosis. Many African countries enforce yellow fever vaccination for travellers arriving from endemic regions. During international outbreaks, destination countries may implement temporary health declarations or screening protocols tailored to the nature of the threat.
India’s travel guidelines
India follows international health regulations and updates its advisories through the Ministry of Health and Family Welfare and the Ministry of External Affairs. For outbound travellers, India mandates yellow fever vaccination for travel to designated countries and issues advisories on polio vaccination when required by destination nations. Guidance is also provided on safe food and water practices, vector avoidance, and routine immunisation. For inbound International travellers, India enforces a yellow fever vaccination requirement for arrivals from endemic regions. It may introduce screening measures during outbreaks, such as those caused by Ebola, Nipah, or COVID-19. Entry rules are revised based on global surveillance and domestic risk assessments.
After travel
The WHO advises travellers to seek medical attention after returning home if they develop fever, persistent diarrhoea, vomiting, jaundice, urinary symptoms, a skin condition, or any symptom suggesting an infection acquired abroad. Travel history, vaccination records, and malaria prophylaxis details assist healthcare providers in diagnosis.
Emporiatrics provides a framework to understand these links and ensures safer mobility. With the right preparation, travellers can reduce health risks and support broader public-health efforts that depend on informed and responsible movement across borders.
(Dr. C. Aravinda is an academic and public health physician. The views expressed are personal. aravindaaiimsjr10@hotmail.com)
Published – December 08, 2025 01:02 pm IST