Filariasis (elephant foot) is common in tropical countries and is caused by parasitic nematode worms that look like tiny threads. Advertisement The disease is caused by nematode worms called Filariae-Wuchereria Bancrofti, Brugia Malayi and Brugia Timori. Most cases of filariasis are caused by a parasite called Wuchereria bancrofti. Filariasis is the leading cause of disability … Continue reading Filariasis: Symptoms, Causes and Treatment