There are not bacteriophages in your body, except where bacteria are. And since they don't infect human cells, they're being constantly destroyed already by the

There are not bacteriophages in your body, except where bacteria are. And since they don't infect human cells, they're being constantly destroyed already by the primary immune system even if they get there. Viral infections only successfully persist by replicating faster then the human body destroys them, and by hiding in human cells. This isn't a system which is some sort of toxic to viruses, it's an immune booster.