...however that works, on a genetic level...mind control?
There are REAL diseases that do that. Or at least, similar things.
There's a kind of bacteria (parasite? I've forgotten) that gets into mice brains and reprograms them to like the smell of cat urine.
The cat catches the mouse, thinking he's all hot stuff.
The bacteria goes "BREEDING PARTY" and breeds like crazy in the cat's intestines.
And is eventually excreted and makes its way back to new mice.