Acanthocheilonemiasis

Definition & Etymology

Acanthocheilonemiasis is a chronic parasitic disease (filariasis) caused by the nematode Acanthocheilonema perstans, also known as Mansonella perstans. It is transmitted to humans by the bite of infected biting midges (genus Culicoides). Adult worms inhabit serous cavities like the pleural, pericardial, and peritoneal spaces, while their microfilariae circulate in the peripheral blood. (Etymology: From Greek akantha, “thorn” + cheilos, “lip” + nema, “thread” + -iasis, “condition of”).

Clinical Significance

Most infections are asymptomatic, though some individuals develop clinical signs. Symptomatic infection may present with transient subcutaneous swellings (similar to Calabar swellings), pruritus, arthralgia, abdominal pain, and fatigue. Eosinophilia is a common laboratory finding. Diagnosis is confirmed by the microscopic identification of unsheathed, non-periodic microfilariae in a peripheral blood smear. This non-periodicity allows for blood sample collection at any time. Treatment is often challenging due to the parasite’s resistance to many standard anti-filarial drugs.

Related Conditions

Acanthocheilonemiasis is grouped with other human filariases, including lymphatic filariasis (Wuchereria bancrofti), onchocerciasis (Onchocerca volvulus), and loiasis (Loa loa). It is a key differential diagnosis for patients from endemic regions presenting with unexplained eosinophilia, subcutaneous nodules, or migratory angioedema. It is a vector-borne helminthiasis.

Key Takeaways

• Acanthocheilonemiasis is a parasitic infection caused by the nematode A. perstans and transmitted by Culicoides biting midges.
• The infection is frequently asymptomatic but can cause subcutaneous swellings, itching, and joint pain, often with eosinophilia.
• Diagnosis is made by identifying characteristic non-periodic microfilariae in blood, allowing for sample collection anytime.

Note: This content is for informational purposes only and does not substitute for professional medical advice. Always consult your doctor for diagnosis and treatment.