African Trypanosomiasis: A Guide to Sleeping Sickness for UK Travellers

African trypanosomiasis, widely known as sleeping sickness, is a serious disease caused by microscopic parasites of the species Trypanosoma brucei. It is transmitted to humans by the bite of an infected tsetse fly. According to NHS insights, the disease is prevalent only in sub-Saharan Africa, specifically in rural areas where the tsetse fly thrives.

There are two types of the disease: Trypanosoma brucei gambiense (West and Central Africa) and Trypanosoma brucei rhodesiense (East and Southern Africa). For British travellers going on safari in countries like Tanzania, Zambia, or Zimbabwe, the Rhodesiense form is the primary concern, as it often presents more acutely and progresses quickly.

Following a bite from an infected tsetse fly, a small sore called a chancre may develop at the site of the bite. However, many patients do not notice this initial sign. The disease typically involves two distinct stages:

The Haemolymphatic Stage

Initially, the parasites multiply in the blood and lymph. Symptoms at this stage are often non-specific and can be confused with a common cold or malaria. They include:

• High temperature (fever)
• Intense headaches
• Muscle and joint aches
• Swollen lymph nodes
• Extreme itchiness (pruritus)

The Neurological Stage

If left untreated, the parasite crosses the blood-brain barrier. This is when the characteristic 'sleeping' symptoms occur, including disrupted sleep patterns, confusion, personality changes, and poor coordination. Without medical intervention, the condition is almost always fatal.

Unlike malaria, there are no preventative tablets or vaccines for sleeping sickness. The best way to protect yourself is to avoid being bitten. NICE guidance suggests that travellers in endemic areas follow strict physical protection measures:

• Wear neutral colours: Tsetse flies are attracted to bright and very dark colours, especially blue. Choose khaki, tan, or olive-green clothing.
• Cover up: Wear long-sleeved shirts and trousers made of medium-weight fabric, as tsetse flies can bite through thin materials.
• Inspect vehicles: Tsetse flies are attracted to the motion and dust of moving cars. Check the interior of your vehicle before entering.
• Avoid bushes: During the hottest part of the day, tsetse flies rest in bushes and thickets.
• Use repellents: While standard DEET is less effective against tsetse flies than mosquitoes, it should still be used as part of a general insect-avoidance strategy to prevent other tropical diseases.

If you have recently returned from a high-risk region in Africa and begin to feel unwell, it is vital to seek medical advice. You can speak to a GP online via OnlineDoctor24 to discuss your travel history and symptoms. While a physical blood test is necessary for a definitive diagnosis, an online consultation is an excellent first step for triage.

Our doctors can review your symptoms against NICE clinical guidelines and advise whether you need urgent hospital referral or specialist tropical medicine assessment. Never ignore a fever after returning from sub-Saharan Africa; early detection can simplify the treatment process significantly.

In the UK, suspected cases of African trypanosomiasis are usually managed in specialist centres such as the Hospital for Tropical Diseases. Diagnosis is confirmed by identifying the parasite in a blood smear, lymph node aspirate, or, in later stages, cerebrospinal fluid via a lumbar puncture.

Treatment depends on the stage of the disease and the specific parasite involved. Modern medications are highly effective but must be administered under specialist supervision. The earlier the diagnosis, the lower the risk of side effects from the medication and the better the chance of a full recovery.