B74.9

Clinical Causes: Transmission occurs through mosquito bites, especially from species that carry filarial worms. Infection is acquired when an infected mosquito bites a person, depositing larvae into the skin. Larvae migrate to lymphatic vessels, where they mature into adult worms over several months. The adult worms produce microfilariae, which circulate in the bloodstream and can infect new mosquitoes. Repeated mosquito bites over time increase the risk of infection.

Key Symptoms: Lymphedema, or swelling, usually of the limbs, genitals, or breast tissue. Heavy and irregular swelling resulting from lymphatic blockage. Hardening and thickening of the skin (fibrosis) in affected areas. Pain or tenderness in swollen regions. Fever and chills during acute episodes. Obstruction of lymphatic vessels may lead to secondary bacterial infections, causing redness, warmth, and further swelling. In some cases, there may be no noticeable symptoms, especially in early stages.

Diagnosis Path: Physical examination noting characteristic swelling and skin changes. Microscopic detection of microfilariae in blood samples, often collected at night when microfilariae are most active. Imaging studies, such as ultrasound, to visualize adult worms within lymphatic vessels. Serological tests or antigen detection methods to confirm infection. Lymphoscintigraphy, a specialized imaging procedure, to assess lymphatic flow and blockages.

Treatment Protocols: Antiparasitic medications, such as diethylcarbamazine (DEC), to kill microfilariae and adult worms. Repeated treatment courses may be necessary for complete eradication. Management of lymphedema with compression therapy, skin care, and physical therapy. Surgical interventions may be considered in advanced cases to reduce swelling or remove affected tissues. Prompt treatment can prevent progression to chronic or disabling stages. Addressing secondary bacterial infections with antibiotics is crucial in managing symptoms.