Leishmaniasis: Prevention and Treatment for UK Travellers

Leishmaniasis is a significant yet often overlooked travel health concern for people from the United Kingdom visiting tropical and subtropical regions. It is a parasitic infection transmitted to humans through the bite of an infected female sandfly. While sandflies are much smaller than mosquitoes and often bite silently, the impact of the disease they carry can be long-lasting.

According to the National Health Service (NHS) and Public Health England, leishmaniasis is not found in the UK, meaning all cases diagnosed domestically are 'imported' by travellers or migrants. As international travel becomes more accessible, understanding the risks in popular destinations—including parts of Mediterranean Europe like Spain, Greece, and Italy—is vital for any British holidaymaker or business traveller.

The disease presents in several forms, depending on the species of the Leishmania parasite and the patient's immune response:

• Cutaneous Leishmaniasis: This is the most common form. It typically results in skin ulcers or sores on exposed parts of the body, such as the face, arms, and legs. These sores can change in size and appearance over time, often beginning as a small papule before becoming a crusty ulcer.
• Visceral Leishmaniasis (Kala-azar): The most severe form, which affects internal organs like the spleen, liver, and bone marrow. It can be fatal if left untreated.
• Mucocutaneous Leishmaniasis: A rarer complication where the infection spreads to the mucous membranes of the nose, mouth, and throat, potentially causing significant tissue damage.

Cutaneous Symptoms

Symptoms of the cutaneous form usually appear weeks or months after a sandfly bite. Look for lesions that are painless or only slightly itchy. They may appear as 'volcano-like' ulcers with a raised edge and central crater. Some lesions may heal on their own, but this can take years and leave significant scarring.

Visceral Symptoms

The visceral form can take months or even years to manifest. Symptoms include persistent fever, significant weight loss, swelling of the abdomen (due to an enlarged spleen or liver), and anaemia. In the UK, if you return from an endemic area and feel generally unwell for more than two weeks, you should seek medical review urgently.

Since there is no vaccine or prophylactic medication for leishmaniasis (unlike malaria), prevention is entirely focused on avoiding sandfly bites. Sandflies are most active from dusk to dawn.

• Use High-Strength Repellent: Apply insect repellent containing 50% DEET to all exposed skin. In the UK, these are readily available from pharmacies and travel clinics.
• Protective Clothing: Wear long-sleeved shirts, long trousers, and socks during times of high activity (evening and night).
• Treated Bed Nets: Ensure you sleep under a fine-mesh mosquito net treated with insecticide. Note that sandflies are smaller than mosquitoes, so a standard net may not always suffice—look for 'sandfly-grade' mesh if possible.
• Avoid Ground Level: Sandflies are weak fliers. Sleeping in an upstairs room or away from damp, shaded outdoor areas can reduce the risk of bites.

Diagnosing leishmaniasis requires specialist knowledge. In the UK, GPs usually refer suspected cases to the Hospital for Tropical Diseases in London or similar regional specialist units. Diagnosis is typically confirmed via a skin biopsy for the cutaneous form or blood tests and bone marrow aspiration for the visceral form.

Treatment depends on the severity and type of infection. Options include topical treatments, cryotherapy, or intravenous medications like sodium stibogluconate or liposomal amphotericin B. NICE guidelines emphasize that clinicians must consider the geographical origin of the infection to determine the likely parasite species and the most effective treatment course.

If you have recently returned from a trip abroad and notice a persistent skin sore that refuses to heal, speaking to a GP online can be an excellent first step. While an online GP cannot perform a biopsy, they can provide a clinical assessment, review photos of the lesion, and discuss your travel history.

An online consultation allows you to quickly determine if your symptoms require an urgent referral to a dermatologist or a tropical medicine specialist. Early intervention is key to preventing cosmetic scarring in cutaneous cases and preventing the progression of the visceral form. You should mention exactly where you travelled, as the risk varies significantly between, for example, a coastal resort in Spain and a rural jungle in Brazil.