Cholera: A British Traveller’s Guide to Vaccination and Safety

Cholera is an acute infection of the small intestine caused by the bacterium Vibrio cholerae. While rare in the United Kingdom, it remains a significant health concern in parts of the world where there is limited access to clean water and adequate sanitation. The infection is primarily spread through the 'faecal-oral' route, typically by consuming food or water contaminated with the faeces of an infected person.

According to the World Health Organization (WHO), researchers estimate that there are millions of cases of cholera globally each year. For UK residents planning international travel, understanding the risk factors and the available preventative measures is essential for a safe trip. While many people infected with cholera have mild symptoms or none at all, the bacteria can cause severe, watery diarrhoea that leads to rapid dehydration if left untreated.

For the majority of British holidaymakers, the risk of contracting cholera is considered very low. This is because most tourists stay in accommodation with high standards of hygiene and safe drinking water. However, the risk increases significantly for specific groups of travellers, including:

• Humanitarian aid workers: Those working in refugee camps or disaster zones where sanitation infrastructure has collapsed.
• Remote travellers: Individuals visiting areas where outbreaks are known to occur and where access to safe water is limited.
• Long-term visitors: People staying for extended periods in endemic regions (parts of Africa, Asia, and the Caribbean).

Before travelling, it is advisable to check the latest updates on the TravelHealthPro website (the clinical arm of the National Travel Health Network and Centre) to see if your destination is currently experiencing an outbreak.

In the UK, the most common vaccine used to prevent cholera is Dukoral. Unlike many other travel vaccinations, this is not an injection; it is an oral vaccine taken as a drink. It works by stimulating the immune system in the gut to protect against the cholera toxin.

The standard course for adults and children over the age of six involves two doses, taken one to six weeks apart. Ideally, the course should be completed at least one week before you travel to ensure maximum protection. For children aged two to six, three doses are required. The vaccine is generally well-tolerated, though some people may experience mild stomach upset or temporary nausea.

It is important to note that the vaccine does not provide 100% protection and does not replace the need for careful food and water hygiene. Furthermore, the cholera vaccine may provide some cross-protection against certain types of E. coli that cause traveller's diarrhoea, though it is not officially licensed for this purpose in the UK.

Symptoms of cholera can appear anywhere from a few hours to five days after exposure. The hallmark of the infection is 'rice-water stool'—diarrhoea that is very watery and pale in appearance. Other symptoms can include:

• Severe nausea and vomiting.
• Leg cramps caused by the loss of salts (electrolytes).
• Restlessness or irritability.

The primary danger of cholera is the speed with which it can cause dehydration. In severe cases, the rapid loss of fluids can lead to a drop in blood pressure and shock. It is vital to begin rehydration therapy immediately if you suspect you or a fellow traveller has contracted the illness.

The mantra for safe travel in areas with poor sanitation is: 'Boil it, cook it, peel it, or forget it.' To minimise your risk of cholera and other water-borne diseases, follow these guidelines:

• Water safety: Only drink bottled water with an intact seal, or water that has been boiled or chemically treated. Avoid ice cubes in drinks, as they are often made from tap water.
• Food hygiene: Eat food that has been thoroughly cooked and is served steaming hot. Avoid raw seafood, salads, and unpeeled fruit.
• Hand hygiene: Wash your hands frequently with soap and clean water, especially before eating or preparing food and after using the toilet. If clean water is unavailable, use an alcohol-based hand sanitiser.
• Daily habits: Even when brushing your teeth, use bottled or treated water rather than tap water.

If you are planning a trip to a high-risk area, you should consult a healthcare professional at least six to eight weeks before your departure. An online GP can provide expert advice on whether the cholera vaccine is necessary for your specific itinerary and can discuss other travel health requirements, such as malaria prophylaxis or vaccinations for Hepatitis A and Typhoid.

If you are currently abroad and develop severe, watery diarrhoea, do not wait. Seek immediate local medical attention. Dehydration can escalate quickly, and professional medical staff can administer intravenous fluids if oral rehydration is insufficient. If your symptoms are mild or you are unsure about your risk after returning to the UK, an online GP consultation can help assess your recovery and provide guidance on any follow-up care needed.