Homeopathy has no scientific basis but its main principle is that " like cures like" , that is when a lot of something causes a symptom, a small amount of that same thing can cure the symptoms.
" Oh! spite of million villains, this makes me a bigot in the fadeless fidelity of man! —and a black! and crazy! —but methinks like-cures-like applies to him too; he grows so sane again."
Lastly, some scientists are fighting fire with fire -- or fighting viruses with bacteria -- by intentionally infecting A. aegypti mosquitoes with a bacterium called Wolbachia.