Are they gonna be the future of antibiotics? They can kill bacteria but can't kill human cells. They're also everywhere, so if you're worried about them evolving. It doesn't matter as they were already out and in your body before you were even born. Unlike antibiotics, they can hunt down only the bad 'bacteria', antibiotics hunt all types of bacteria; bad or good. They can evolve unlike antibiotics, so if the bacteria evolves against them, they will evolve back. So are they the good viruses?