A type of Bacteria which is harmless to Human Cells. Bacteriophages aren't yet allowed into the public without extreme authority from the person's being injected with them, because Medical companies complain to the FDA about losing money over little bugs who do all the work. The Bacteriophage is essentially a tracking missile that kills all the dangerous bacteria in our body. It straps itself onto the bacteria, anf injects a liquid known as Andolycin, which bursts a hole in the bacteria. Before they inject Andolycin, they inject their Deoxyribo Neuclaic Acid, (D.N.A.) forcing the Bacteria to make more Phages. Anyways, this is getting to be too much of an explanation, most people won't even find this but, I hope I helped people in the long run. Credits to Kurzgesagt for the information on this, you can watch his video on it for more information.