Getting the <i>broad spectrum of bacteriophages</i> is not easy.  Nor is a sample of infected tissue (ex: meningitis).<p>Don&#x27;t get me wrong, it could be a viable backup. But, it&#x27;s not nearly as useful for things like surgery where you want to knock everything down before there is a problem. And it&#x27;s not nearly as cheap as handing out penicillin was.<p>PS: Another issue is separating out the Bacteria phages without introducing a lot of new possible infections.