Overview
Malaria is an infection caused by parasites that are usually spread to people through mosquito bites. It can become severe quickly, especially in young children, pregnant people, older adults, and people without prior exposure to malaria. For travellers, prevention starts before departure with destination-specific advice and a plan for avoiding mosquito bites.
Key Symptoms
Malaria often causes fever, chills, sweating, headache, body aches, tiredness, nausea, or vomiting. Symptoms can begin during travel or after returning home, sometimes days to weeks later and occasionally later depending on the type of malaria. Not everyone has the same symptoms, so any fever after travel to a malaria-risk area should be taken seriously.
Causes and Risk Factors
Malaria is caused by Plasmodium parasites, which are passed to humans by infected Anopheles mosquitoes. Risk is higher in places where malaria is common, during seasons with more mosquitoes, and when travellers stay in rural areas, sleep without protective barriers, or spend time outdoors when mosquitoes are active. Risk can also vary within the same country, so destination details matter.
Who Is Affected
Anyone traveling to a malaria-endemic area can be affected, especially people who have no previous immunity. People visiting friends and relatives may have higher risk if they stay longer, stay in local housing, or assume they are protected because of past residence in a malaria area. Pregnant travellers, infants, young children, and people with weakened immune systems need extra planning because malaria can be more serious for them.
Prevention
Before travel, check whether your destination has malaria risk and ask a healthcare professional or travel clinic if preventive medication is recommended. Reduce mosquito bites by using insect repellent, wearing long sleeves and trousers, staying in screened or air-conditioned rooms when possible, and sleeping under an insecticide-treated bed net if needed. Take any prescribed preventive medicine exactly as directed and complete it for the full recommended period. Even if you take preventive medicine, you still need bite prevention because no method gives complete protection.
Diagnosis and Tests
Malaria is diagnosed with blood tests, which may include rapid diagnostic tests and microscopy. Testing is important because malaria symptoms can look like many other illnesses, including flu-like infections or other travel-related diseases. If you become ill after travel, tell the clinician exactly where you went and when you were there.
When to Seek Medical Care
Seek medical care promptly if you develop fever, chills, headache, vomiting, unusual tiredness, or flu-like illness during travel in a malaria area or after you return. Tell the healthcare team about all countries visited, stopovers, dates of travel, and whether you took malaria prevention medicine. Do not wait to see if symptoms pass on their own.
When It May Be an Emergency
Get urgent emergency help if a traveller with possible malaria has trouble breathing, confusion, seizures, fainting, severe weakness, repeated vomiting, or is difficult to wake. Emergency care is also important for infants, pregnant people, or anyone who becomes rapidly more unwell after travel to a malaria-risk area. Severe malaria can worsen quickly and needs immediate treatment.
Questions to Ask a Healthcare Professional
Ask whether malaria is present in every part of your destination or only certain regions, and whether preventive medicine is advised for your itinerary. You can also ask what mosquito bite precautions are most important for your trip, what symptoms should prompt testing, and how long after travel malaria could still appear. If you take regular medicines or are pregnant, ask how that affects travel planning.