Zoonotic Filaria in a Subcutaneous Artery of a Child in Costa Rica

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  • Tulane University School of Public Health and Tropical Medicine, University of Costa Rica, University City, Hospital Nacional de Niños, 1430 Tulane Avenue, New Orleans, Louisiana 70112, Costa Rica

A 2-year-old boy from a rural community of Costa Rica was admitted to hospital with a rash of increasing severity over an area of the flank about 8 cm in diameter. Sections of a biopsy from the center of the affected area revealed a necrotic mature, infertile, female filaria about 120 µm in diameter in a subcutaneous artery, surrounded by a layer of dense eosinophilic granulomatous reaction which at one point, along with the worm, extended into the dermis. The worm, readily distinguished from Dirofilaria, Onchocerca, Wuchereria and Brugia, was unidentified.