Bancrftian filariasis caused by Wucheria Bancrofti is transmitted in man by the bite of infected mosquites – culex and mansonia. This infection causes lymphangitis ,lymphadenitis , elephantiasis of genitals, legs and arms and causes tropical eosinophilia due to hypersensitivity.

600 million people are at risk and 60 million are infected in S-E Asia.In India 454 million are at risk and 48 million are infected.