African Trypanosomiasis (Sleeping Sickness): A UK Guide to Risks and Prevention

African Trypanosomiasis, commonly referred to as Sleeping Sickness, is a serious parasitic disease found only in sub-Saharan Africa. It is caused by microscopic parasites of the genus Trypanosoma, which are transmitted to humans through the bite of an infected tsetse fly. According to the World Health Organization and NHS travel guidance, the disease predominantly affects rural populations, but it remains a critical consideration for British travellers visiting game parks or working in endemic regions.

There are two types of the disease: Trypanosoma brucei gambiense, found in West and Central Africa, and Trypanosoma brucei rhodesiense, found in East and Southern Africa. While the former causes a chronic infection that can last years, the latter is acute and can lead to severe illness within weeks of the initial bite. Understanding these risks is essential for anyone planning a safari or humanitarian work in affected areas.

Symptoms of African trypanosomiasis occur in two distinct stages. Identifying the first stage is difficult because it mimics many common tropical illnesses, such as malaria or flu.

Stage 1: The Haemolymphatic Phase

• Chancre: A painful red sore may develop at the site of the tsetse fly bite within one to three weeks.
• Fever and Headaches: Intermittent bouts of high temperature accompanied by severe headaches.
• Joint Pain: Aching in the limbs (arthralgia) and general malaise.
• Swollen Lymph Nodes: Specifically at the back of the neck (known as Winterbottom’s sign).

Stage 2: The Neurological Phase

This stage begins once the parasite crosses the blood-brain barrier. Symptoms become significantly more severe and include:

• Sleep Disturbances: The hallmark symptom, where the patient experience daytime somnolence (extreme sleepiness) and nighttime insomnia.
• Behavioural Changes: Confusion, irritability, and personality shifts.
• Neurological Decline: Poor coordination, tremors, and eventually coma if left untreated.

Because there is no vaccine or prophylactic pill for sleeping sickness, prevention is entirely behavioural. Tsetse flies are distinct from mosquitoes; they are large, daytime feeders, and are attracted to motion and dark colours.

• Wear Neutral Colours: Tsetse flies are highly attracted to bright and very dark colours, particularly blue and black. Stick to olive, tan, or khaki clothing.
• Use Heavy-Weight Fabrics: The tsetse fly can bite through thin materials. Choose medium-to-heavy weight cotton or canvas clothing.
• Full Coverage: Keep arms and legs covered with long-sleeved shirts and trousers tucked into socks.
• Use Insect Repellent: While DEET is effective against mosquitoes, its efficacy against tsetse flies is limited. However, it should still be used as part of a broader insect-avoidance strategy to prevent other diseases like malaria.
• Inspect Vehicles: Tsetse flies are attracted to the dust and heat of moving vehicles. Always check the interior of your car or safari jeep before setting off.

If you have recently returned from sub-Saharan Africa and are feeling unwell, it is important to seek medical advice promptly. You may choose to speak to a GP online for an initial assessment of your symptoms and travel history. While an online doctor cannot perform the blood tests or lumbar punctures required to diagnose sleeping sickness, they can provide a vital screening service.

During a consultation, a GP will evaluate your risk based on the specific regions you visited and the nature of your activities. If trypanosomiasis is suspected, they will facilitate an urgent referral to a tropical medicine specialist or the Hospital for Tropical Diseases. Early intervention is the most effective way to prevent the disease from progressing to the dangerous neurological stage.

In the UK, the diagnosis of African trypanosomiasis is managed by infectious disease specialists following NICE clinical pathways. Diagnosis usually involves microscopic examination of blood, lymph node fluid, or skin chancre fluid to detect the parasites. If the disease has progressed, a lumbar puncture is required to check the cerebrospinal fluid.

Treatment depends on the stage of the disease and the specific parasite strain. Modern treatments, such as fexinidazole, have made management much easier, as they can often be taken orally. However, late-stage neurological infections still require intensive hospital monitoring. The outlook for recovery is excellent if treatment begins before the central nervous system is involved.