Acanthocheilonemiasis

A parasitic disease caused by filarial worms

Acanthocheilonemiasis
Synonyms	Dipetalonemiasis
Specialty	Infectious disease, Parasitology, Tropical medicine
Symptoms	Fever, itching, rash, joint pain, muscle pain, lymphadenopathy, eosinophilia
Complications	Chronic infection, possible neurological symptoms or skin lesions
Usual onset	Gradual, weeks to months after infection
Duration	Chronic without treatment
Causes	Infection by the parasitic filarial worm Acanthocheilonema perstans
Risk factors	Exposure to infected biting midges or mosquitoes in endemic regions
Diagnosis	Detection of microfilariae in peripheral blood smear, serology, PCR testing
Differential diagnosis	Other filarial infections (e.g. Loiasis, Onchocerciasis, Mansonelliasis)
Prevention	Avoiding insect bites using insect repellent, protective clothing, and bed nets
Treatment	Antiparasitic medication
Medication	Ivermectin, Diethylcarbamazine (DEC), Albendazole
Prognosis	Generally good with treatment; can become chronic if untreated
Frequency	Endemic in parts of Central Africa and South America
Deaths	Rare

Acanthocheilonemiasis is a parasitic disease caused by infection with the filarial worm Acanthocheilonema perstans. This disease is part of a group of infections known as filarial diseases, which are caused by nematodes (roundworms) of the order Spirurida. These parasites are transmitted to humans through the bites of infected insect vectors, primarily biting midges of the genus Culicoides.

Transmission

The primary mode of transmission of acanthocheilonemiasis is through the bite of an infected biting midge. When a midge carrying the infective larvae bites a human, the larvae are deposited on the skin and enter the body through the bite wound. Once inside the host, the larvae migrate to subcutaneous tissues where they mature into adult worms.

Life Cycle

The life cycle of Acanthocheilonema perstans involves both a human host and an insect vector. Adult worms reside in the subcutaneous tissues of the human host, where they produce microfilariae. These microfilariae circulate in the bloodstream and are ingested by a biting midge during a blood meal. Inside the midge, the microfilariae develop into infective larvae, which are then transmitted to another human host when the midge feeds again.

Symptoms

In many cases, acanthocheilonemiasis is asymptomatic, meaning that infected individuals do not exhibit noticeable symptoms. However, when symptoms do occur, they may include:

• Skin rashes
• Itching
• Swelling of the skin
• Joint pain
• Fever

The symptoms are generally mild, but in some cases, they can lead to more significant discomfort and complications.

Diagnosis

Diagnosis of acanthocheilonemiasis is typically made by identifying the presence of microfilariae in the blood. A blood sample is taken from the patient and examined under a microscope. The microfilariae of Acanthocheilonema perstans have distinctive morphological features that allow for their identification.

Treatment

Treatment of acanthocheilonemiasis involves the use of antiparasitic medications. The drug of choice is usually diethylcarbamazine (DEC), which is effective in reducing the number of microfilariae in the blood. In some cases, ivermectin may also be used. Treatment regimens may vary depending on the severity of the infection and the presence of any complications.

Prevention

Preventive measures for acanthocheilonemiasis focus on reducing exposure to the insect vectors. These measures include:

• Using insect repellent on exposed skin
• Wearing long-sleeved clothing and pants to minimize skin exposure
• Installing screens on windows and doors to keep insects out
• Using bed nets treated with insecticide

Epidemiology

Acanthocheilonemiasis is primarily found in tropical regions of Africa and South America. The distribution of the disease is closely linked to the habitat of the biting midges that serve as vectors. Areas with high humidity and dense vegetation are particularly conducive to the proliferation of these insects.

Related pages

• Filarial diseases
• Parasitic diseases
• Vector-borne diseases