HIV/AIDS, Malaria, and TB are the unholy Trinity of illness in the developing world. But there are a number of less widely known diseases, which while not fatal, cause a great deal of sickness, suffering, and disability. One of them is Lymphatic Filariasis, also known as Elephantiasis. But what is it? LF is a disease that is transmitted by mosquitoes that bite infected humans and pick up microfilariae – thread like parasitic worms. Below is a picture.