A bacteriophage, also known informally as a phage, is a virus that infects and replicates within Bacteria and Archaea.Bacteriophage infects bacteria by inserting its genetic material into the host cell.If bacteriophage is injected to human body it only attack the bacteria pathogen not the human body.Because bacteriophage is only alive when it is infected to bacteria and it will be seen as dead when it on human body and not infected to any bacteria.
It is possible.This is medically termed as Phage therapy.Phage therapy has many potential applications in human medicine.