Nelson Textbook of Pediatrics 22nd Edition | Lymphatic filariasis is caused by Wuchereria bancrofti (90% of cases), Brugia malayi, and Brugia timori. Transmitted by mosquitoes. Adult worms live in lymphatic vessels, causing lymphangitis, lymphedema, hydrocele, and elephantiasis. Microfilariae circulate in blood with nocturnal periodicity. Tropical pulmonary eosinophilia (TPE) is a hypersensitivity reaction to microfilariae in the lungs. Diagnosis: blood smear (thick, Giemsa, drawn at night), antigen detection, or ultrasound (filarial dance sign). Treatment: diethylcarbamazine (DEC) or ivermectin + albendazole. Mass drug administration (MDA) programs aim for elimination.
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