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Malaria and fever in the returning traveller
Fever in a traveller back from an endemic area (mainly sub-Saharan Africa) is malaria until proven otherwise — repeated thick and thin blood films and a rapid antigen test; falciparum malaria with severe features is treated with intravenous artesunate.
Why it matters in the exam
The question presents a young person who returned a few weeks ago from Africa, with fever, rigors, headache and muscle pain, sometimes with thrombocytopenia, jaundice or confusion. The first step is a thick and thin blood film and a rapid test, repeating the films every 12–24 hours up to 3 times if negative. P. falciparum usually appears in the first month after return, while P. vivax and P. ovale can appear months or even years later because of dormant liver forms. Features of severe malaria: impaired consciousness or seizures, parasitaemia of 5% or more, severe anaemia (Hb below 7 g/dL), kidney failure, ARDS, hypoglycaemia, acidosis and shock — then intravenous artesunate and admission.
In uncomplicated falciparum malaria an artemisinin-based combination (artemether-lumefantrine) or atovaquone-proguanil is given. In vivax and ovale, primaquine is added to clear the liver forms — after a G6PD test and not in pregnancy. Prevention for travellers: atovaquone-proguanil, doxycycline or mefloquine, and more importantly — bite avoidance. The differential of fever after travel: dengue (thrombocytopenia, leukopenia, retro-orbital pain — avoid NSAIDs), typhoid (relative bradycardia, constipation, blood cultures; ceftriaxone or azithromycin), rickettsiae (a black eschar — doxycycline) and leptospirosis; and fever with bleeding in someone back from an affected area — isolation and suspicion of viral haemorrhagic fever.
Key points
- Fever after travel to an endemic area = malaria until proven otherwise.
- Thick and thin film and a rapid test, up to 3 times.
- Severe malaria: intravenous artesunate.
- Uncomplicated: artemether-lumefantrine or atovaquone-proguanil; vivax and ovale — primaquine after G6PD.
- Differential: dengue, typhoid, rickettsiae, leptospirosis.
Summary table
| Topic | Finding | Action | Exam note |
|---|---|---|---|
| Suspected malaria | Fever after travel to an endemic area | Thick and thin film + rapid test; repeat up to 3 times | Falciparum usually in the first month |
| Severe malaria | Consciousness, seizures, parasitaemia 5% or more, Hb below 7 g/dL, kidney, ARDS, hypoglycaemia, shock | Intravenous artesunate, admission | An emergency |
| Uncomplicated falciparum | No severe features | Artemether-lumefantrine or atovaquone-proguanil | Follow parasitaemia |
| Vivax or ovale | Recurrent fever, months after return | Treatment + primaquine for liver forms | G6PD first; not in pregnancy |
| Dengue | Thrombocytopenia, leukopenia, retro-orbital pain | NS1 or serology; fluids | No NSAIDs |
| Typhoid | Relative bradycardia, constipation, abdominal pain | Blood cultures | Ceftriaxone or azithromycin |
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Sources
- WHO Guidelines for Malaria, 2023 — Diagnosis, severe malaria and artemisinin-based treatment
- CDC Yellow Book: Health Information for International Travel, 2024 — Fever in the returned traveler; malaria prophylaxis
- Harrison's Principles of Internal Medicine, 21st edition (2022) — Malaria; Approach to the Febrile Returning Traveler
Sources are given for further reading; the text is written afresh and not copied from them.
Reviewed by the Examqo AI Professor · 2026-11-02. The text may contain errors; when in doubt, check the source.