What are the main symptoms or signs of Malaria: fever after travel is an emergency?

Common signs vary from person to person. The article above lists the symptoms to watch for, how they progress, and when they need medical attention.

When should you see a doctor for Malaria: fever after travel is an emergency?

See a doctor if symptoms last more than a few weeks, get worse quickly, stop you doing everyday things, or if you notice sudden pain, breathing trouble, fainting or bleeding.

Infectious Diseases

Malaria: fever after travel is an emergency

Hours can decide the outcome

Dr. Yanis Kaddour

Infectious disease specialist

7 min read

Medical illustration of Malaria: fever after travel is an emergency

In simple terms

How the parasite cycles in the blood, why any fever after travel needs testing, and how to prevent it.

What it is, in plain words

Malaria is caused by Plasmodium parasites transmitted by night-biting Anopheles mosquitoes. The parasites multiply in the liver, then invade red blood cells and burst out in synchronised waves, which produces the cycles of fever and chills. Plasmodium falciparum can become life-threatening within 24 hours.

Signs to look out for

Fever, often with shaking chills then drenching sweats
Headache, muscle aches, fatigue, nausea and vomiting, easily mistaken for flu
Diarrhoea and abdominal pain, especially in children
Jaundice, dark urine and anaemia
Severe forms: confusion, seizures, breathing difficulty, kidney failure, coma

Why it happens

Risk depends on destination, season and precautions. Symptoms usually appear seven days to three months after exposure, and can appear up to a year later with some species. Pregnant women, young children and travellers who grew up abroad and return to visit family are at particular risk.

How doctors confirm it

A blood film or rapid diagnostic test gives an answer within an hour, and must be requested for any fever in someone who has been in a malaria area within the last year. A single negative test does not exclude it; repeat testing over 48 hours if suspicion remains.

Treatments and solutions

Artemisinin-based combination therapy for uncomplicated falciparum malaria, taken exactly as prescribed
Intravenous artesunate in hospital for severe malaria, which is a medical emergency
Primaquine or tafenoquine after checking G6PD status, to clear liver forms of vivax and ovale malaria
Prevention before travel: chemoprophylaxis chosen for the destination, started before departure and continued after return
Bite avoidance: insecticide-treated nets, repellents containing DEET, covering skin from dusk to dawn, and air conditioning

Living with it day to day

Never assume a fever after travel is just flu, and never stop prophylaxis early because you feel fine: the post-travel doses are the ones that prevent disease.

When to seek medical help

Go to an emergency department the same day for any fever within a year of travel to a malaria area, and immediately for confusion, seizures or breathlessness.

This article explains general health information in simple language. It does not replace advice from your own doctor.

The words explained

Medical terms used above, in everyday language.

Symptom: A sign you can feel or see that something is wrong, like pain, tiredness or a rash.
Diagnosis: The moment a doctor identifies which illness is causing your symptoms.
Prevention: Steps taken before a problem starts, to make it less likely.

When should you see a doctor?

Your symptoms last more than a few weeks or keep coming back.
They get worse quickly, or stop you doing everyday things.
You notice sudden pain, breathing trouble, fainting or bleeding — seek urgent care.
You already take medication and want to change anything about it.

This article explains general health information. It does not replace advice from your own doctor.

Frequently asked questions

What is Malaria: fever after travel is an emergency?: How the parasite cycles in the blood, why any fever after travel needs testing, and how to prevent it.
What are the main symptoms or signs of Malaria: fever after travel is an emergency?: Common signs vary from person to person. The article above lists the symptoms to watch for, how they progress, and when they need medical attention.
When should you see a doctor for Malaria: fever after travel is an emergency?: See a doctor if symptoms last more than a few weeks, get worse quickly, stop you doing everyday things, or if you notice sudden pain, breathing trouble, fainting or bleeding.

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