Malaria Prevention for Travellers: The Complete UK Guide

Everything you need to know about antimalarial tablets, mosquito bite avoidance, malaria symptoms, and what to do if you feel unwell after returning from a high-risk destination.

What Is Malaria? Understanding the Risk to UK Travellers

Malaria is a serious and potentially life-threatening tropical disease caused by Plasmodium parasites transmitted through the bites of infected female Anopheles mosquitoes. According to the World Health Organisation, there were an estimated 249 million malaria cases globally in 2022 — making it one of the most significant health risks facing international travellers.

For UK travellers, malaria is not an abstract threat. Approximately 1,500–2,000 cases of imported malaria are reported in the UK each year, with Plasmodium falciparum — the most dangerous species — accounting for the majority of life-threatening cases in returning travellers.

The disease is prevalent across sub-Saharan Africa, South and Southeast Asia, Central America, South America, and parts of the Caribbean. Without prompt diagnosis and treatment, P. falciparum malaria can progress to severe anaemia, organ failure, cerebral malaria, and death within 24–48 hours of symptom onset.

Which Countries Carry the Highest Malaria Risk?

Malaria transmission risk varies significantly by destination, altitude, season, and whether you are in a rural or urban area. The following regions carry the highest risk for UK travellers:

The ABCD Framework for Malaria Prevention

UK travel medicine experts recommend a four-part framework for malaria prevention. Following all four steps significantly reduces your risk of contracting malaria and ensures rapid treatment if infection does occur.

Mosquito Bite Avoidance: Your First Line of Defence

No antimalarial tablet provides 100% protection against malaria. This is why bite avoidance must always be used alongside chemoprophylaxis. Additionally, mosquitoes in malaria-endemic regions can also carry dengue fever, chikungunya, Zika virus, and other diseases for which no preventative medication exists — making physical protection even more important.

DEET-based insect repellent

Repellents containing 20–50% DEET (diethyltoluamide) are the most effective and widely recommended option for preventing mosquito bites. Apply to all areas of exposed skin, particularly from dusk to dawn — the period when Anopheles mosquitoes that carry malaria are most active. Reapply after sweating or swimming.

Picaridin-based repellents are an effective alternative for people who find DEET irritates their skin, particularly for children.

Protective clothing

• Wear long-sleeved tops and long, loose-fitting trousers, especially after sunset
• Light-coloured clothing is less attractive to insects
• Consider permethrin-treated clothing for extended trips in high-risk areas
• Tuck trousers into socks when in forested or rural areas

Sleeping and accommodation precautions

• Book accommodation with insect screens on windows and doors and air conditioning where possible
• Sleep under a mosquito net treated with permethrin insecticide — particularly important in budget or remote accommodation
• Use plug-in insecticide vaporisers in your sleeping area
• Check nets and screens for holes before use

Antimalarial Tablets: Which One Is Right for You?

Antimalarial chemoprophylaxis (preventative medication) is recommended for travel to moderate- and high-risk areas. In the UK, three main antimalarial medicines are prescribed for travellers:

Malaria Symptoms: What to Look Out For

Malaria symptoms can appear anywhere from 7 days after exposure to several months after returning from a risk area. The incubation period depends on the Plasmodium species: P. falciparum typically presents within 7–14 days, while P. vivax and P. ovale can lie dormant and relapse months or even years later.

Common malaria symptoms

It is important to note that not all people infected with malaria experience the classic cyclical fever pattern. Some people — particularly those who have taken antimalarial prophylaxis — may have atypical or milder presentations. If you have been in a malaria-risk area in the past 12 months and develop any of the symptoms above, seek same-day medical advice regardless of whether you took antimalarials.

Advice for Returning UK Travellers

Complete your full course of antimalarials

One of the most common mistakes travellers make is stopping their antimalarial tablets as soon as they arrive home. Malarone must be continued for 7 days after leaving the malaria-risk area. Doxycycline and mefloquine require 4 weeks of post-travel dosing. Stopping early significantly increases your risk of contracting malaria from parasites that may already be in your bloodstream.

Monitor for symptoms for up to 12 months

While P. falciparum malaria typically presents within 3 months of exposure, dormant forms of P. vivax and P. ovale can cause relapse infections 6–12 months — or, in rare cases, several years — after the initial infection. Always mention your travel history to any doctor you consult in the year following a trip to a malaria-risk area.

What to do if you feel unwell after travel

• Contact your GP or NHS 111 immediately if you develop a fever
• Tell the clinician you have recently travelled to a malaria-risk area — this is critical information
• A rapid diagnostic test (RDT) or blood film should be performed on the same day you develop a fever
• Do not accept reassurance that “it’s just a virus” until malaria has been formally excluded
• If you cannot reach a GP, attend your nearest urgent care centre or A&E and state your travel history clearly