Sleeping Sickness (African Trypanosomiasis): Prevention and Risks for UK Travellers

African trypanosomiasis, commonly known as sleeping sickness, is a serious tropical disease caused by parasites of the genus Trypanosoma. It is transmitted to humans via the bite of the tsetse fly, which is found only in sub-Saharan Africa. For British travellers, the risk is generally low, but it is a significant consideration for those planning safaris, trekking in remote areas, or working in rural regions of the continent.

There are two main forms of the disease. The West African form (Trypanosoma brucei gambiense) accounts for the majority of cases and causes a chronic infection that can last for years before symptoms become severe. The East African form (Trypanosoma brucei rhodesiense) is more acute, progressing rapidly over weeks or months. Understanding these risks is vital for anyone using an online doctor UK service for pre-travel advice.

The symptoms of sleeping sickness develop in two distinct stages. In the first stage, known as the haemolymphatic phase, the parasite multiplies in the blood and lymph. Patients often experience:

• Bouts of fever and sweating.
• Severe headaches and irritability.
• Extreme fatigue and muscle or joint pains.
• Swollen lymph nodes, particularly at the back of the neck (Winterbottom's sign).
• A painful, red sore (chancre) at the site of the fly bite.

The second stage occurs when the parasite crosses the blood-brain barrier into the central nervous system. This leads to the characteristic sleep disturbances, including daytime somnolence and nighttime insomnia, as well as confusion, personality changes, and difficulty with coordination. NICE guidance emphasises that early diagnosis is critical, as the disease is far easier to treat before it reaches the neurological stage.

Unlike malaria, there are no prophylactic tablets for sleeping sickness, and there is no vaccine. Protection is entirely behavioural. Tsetse flies are attracted to dark or bright colours, particularly blue and black. British travellers are advised to:

• Wear neutral colours: Opt for khaki, olive, or tan clothing. Avoid bright or very dark shades.
• Choose heavy fabrics: Tsetse flies can bite through thin materials; medium-weight linen or cotton is preferable.
• Use insect repellent: While standard DEET-based repellents are less effective against tsetse flies than mosquitoes, they are still recommended as part of a broader insect-avoidance strategy.
• Check vehicles: Tsetse flies are attracted to moving vehicles and dust. Inspect the interior of your car or safari jeep before boarding.
• Avoid bushes: The flies typically rest in bushes during the heat of the day, so avoid walking through dense vegetation where possible.

If you return to the UK and feel unwell after visiting an endemic area, it is essential to inform a healthcare professional of your travel history. Diagnosis usually involves blood tests to identify the parasite or a lumbar puncture if neurological symptoms are present. Treatment in the UK is managed by specialist infectious disease units, often at the Hospital for Tropical Diseases in London or similar regional hubs.

The medications used depend on the stage and type of the disease. While these treatments are effective, they can be complex and require hospital monitoring. Following NHS protocols, anyone suspected of having a tropical infection will be fast-tracked for specialist assessment.

You may wish to speak to a GP online before your trip to discuss your itinerary and receive comprehensive pre-travel advice. A GP can help you understand which regions carry the highest risk and advise on the necessary vaccinations for other diseases like Yellow Fever or Hepatitis A.

Post-travel, an online consultation is a convenient way to discuss mild symptoms or concerns about insect bites. However, if you have a high fever, severe headache, or neurological symptoms after returning from Africa, you must seek urgent in-person medical care or contact NHS 111 immediately, as these may indicate a medical emergency such as malaria or acute sleeping sickness.