Knowlesi malaria: what should you know?

Knowlesi malaria is caused by a malaria parasite that can pass to people through the bite of an infected mosquito. Exposure is associated with forested or rural areas in parts of Southeast Asia. Symptoms may include fever, chills, sweats, headache, tiredness, and muscle aches. Symptoms can resemble other forms of malaria or a common infection, so travel history and testing matter. A negative early result may not settle the question if symptoms continue; a clinician decides whether repeat assessment is needed.

Contact a medical service promptly if you develop fever or chills during travel or after returning from an area where malaria occurs. Tell the clinician the countries and places visited, dates of travel, mosquito exposure, medicines, and when symptoms began. A blood test can look for malaria parasites and help guide treatment. Do not rely on fever medicine alone or wait for symptoms to become severe. People planning travel should arrange a travel health consultation and ask whether malaria prophylaxis is appropriate for the itinerary.

Go to urgent care immediately for confusion, fainting, trouble breathing, repeated vomiting, inability to drink, seizures, severe weakness, or rapidly worsening fever. Malaria can become serious, and knowlesi malaria may progress quickly. Tell emergency staff about recent travel even if the trip ended some time ago. A person with fever after travel should not assume the illness is influenza or another routine infection until malaria has been considered.

Ask which tests are needed, whether testing should be repeated, how treatment will be monitored, and which warning signs require hospital care. Discuss prevention for future travel, including mosquito protection and whether prophylaxis fits your destination and health history.