when you ask about Elephantiasis are you speaking of Falaria?
the outward appearance looks the same and may have similar cause an infestation of fly larvae that take years to mature and as they do the body is filed with them and the limbs of a person become enlarged.
You will need to get a zapper that has a frequency range between 500kHz and 7500kHz In this range you can kill off Vivax malaria, and Falcifarum Malaria I, II,III and IV, and Falaria. I am sure that the other types found in South America and Africa also fall into that frequency range.