What should you know about the Duffy blood group and malaria?

Duffy is a set of markers found on red blood cells. Some malaria parasites use a Duffy marker as part of their entry process, so inherited Duffy patterns may affect susceptibility to particular malaria species. Protection is not absolute, and other malaria parasites can use different pathways. Your blood group therefore cannot confirm or exclude malaria after travel or a mosquito exposure.

If you are travelling to a malaria area, arrange a travel health consultation early enough to discuss mosquito-bite protection and malaria prophylaxis. Use repellent, clothing that covers skin, screened or air-conditioned sleeping spaces and a bed net when appropriate. If fever develops during travel or after returning, tell the clinician where you have been and when; a blood test may be needed even if you know your Duffy type.

Fever, chills, sweating, headache, muscle aches, marked weakness or vomiting after possible exposure need prompt medical assessment. Malaria can worsen quickly, so do not wait for symptoms to follow a predictable pattern. Seek emergency help for confusion, breathing difficulty, seizures, fainting or inability to keep fluids down.

Ask whether your destination carries malaria, which prevention plan suits your health and medicines, whether your Duffy result changes anything clinically, and which symptoms after travel should trigger immediate testing.