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Parasitaemia – Definition, Causes and Treatment
Parasitaemia refers to the presence of parasites in the bloodstream. It occurs in infectious diseases such as malaria and requires prompt medical evaluation.
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Parasitaemia refers to the presence of parasites in the bloodstream. It occurs in infectious diseases such as malaria and requires prompt medical evaluation.
What is Parasitaemia?
Parasitaemia (also spelled parasitemia) describes a condition in which parasites – single-celled or multicellular microorganisms – are detectable in a person's blood. The blood may serve as either a transport medium or a site of reproduction for the pathogen. Parasitaemia is not a disease in itself but rather a laboratory finding that indicates an underlying infectious disease.
Causes and Responsible Parasites
Several types of parasites can cause parasitaemia. The most common and clinically significant include:
- Plasmodium species: The causative agents of malaria, transmitted by Anopheles mosquitoes. This is the most frequent cause of parasitaemia worldwide.
- Trypanosoma brucei: The agent of African sleeping sickness (African trypanosomiasis), transmitted by the tsetse fly.
- Trypanosoma cruzi: The agent of Chagas disease, predominantly found in Latin America.
- Babesia species: The agents of babesiosis, transmitted by ticks.
- Leishmania species: In visceral forms, parasites may also circulate in the blood.
- Microfilariae: Larvae of filarial worms (e.g., Wuchereria bancrofti) in lymphatic filariasis.
Symptoms
Clinical manifestations of parasitaemia depend heavily on the causative organism and the parasite burden in the blood. Common symptoms include:
- Fever, often cyclical or wave-like (characteristic of malaria)
- Chills and sweating
- Fatigue and general malaise
- Headache and muscle or joint pain
- Anaemia due to destruction of red blood cells
- Enlargement of the spleen and liver (splenomegaly, hepatomegaly)
- In severe cases: organ failure or impaired consciousness (e.g., cerebral malaria)
Diagnosis
Parasitaemia is diagnosed primarily through laboratory examination of blood samples:
- Blood smear and thick film: Microscopic examination of a stained blood preparation; the gold standard for malaria diagnosis.
- Rapid diagnostic tests (RDTs): Antigen-based tests for rapid identification of specific parasites, particularly in malaria.
- PCR (Polymerase Chain Reaction): Highly sensitive molecular detection of parasite DNA in the blood.
- Serology: Detection of antibodies against specific parasites.
- Parasitaemia level: In malaria, the percentage of infected red blood cells is calculated to assess disease severity.
Treatment
Therapy depends on the identified parasite and the severity of the infection:
- Malaria: Artemisinin-based combination therapies (ACT) for uncomplicated cases; intravenous artesunate for severe malaria.
- African trypanosomiasis: Fexinidazole or pentamidine depending on the disease stage and species.
- Chagas disease: Benznidazole or nifurtimox.
- Babesiosis: Combination of atovaquone and azithromycin, or clindamycin and quinine.
- Filariasis: Diethylcarbamazine (DEC) or ivermectin.
High levels of parasitaemia or severe clinical presentations may require inpatient hospital care. Travellers returning from tropical regions who develop fever should seek immediate medical attention.
Prevention
Prevention of parasitaemia is tailored to the specific pathogen and travel destination. Key measures include:
- Antimalarial chemoprophylaxis (e.g., atovaquone-proguanil) for travel to endemic regions
- Use of insect repellents and mosquito nets
- Wearing protective clothing to avoid mosquito and tick bites
- Vaccination where available (e.g., the RTS,S malaria vaccine)
References
- World Health Organization (WHO): World Malaria Report 2023. Geneva: WHO Press, 2023.
- Lell B, Kremsner PG. Clindamycin as an antimalarial drug: review of clinical trials. Antimicrobial Agents and Chemotherapy, 2002; 46(8): 2315–2320.
- Beare NA, Taylor TE, Harding SP, Lewallen S, Molyneux ME. Malarial retinopathy: a newly established diagnostic sign in severe malaria. American Journal of Tropical Medicine and Hygiene, 2006; 75(5): 790–797.
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