Subject: Evolutionary selection technique to combat 'Superbugs'

As I understand it, "Superbugs," pathogens evolving a resistance to antibiotics
and other traditional remedies in response to their overuse, are slowly becoming
a serious problem.  However, it seems to me that the very process that creates
these combative strains could be used to discover new treatments for them. Could
new treatments be discovered by using the superbugs themselves to destroy
colonies of otherwise harmless bacteria, acting as a selector for any
resistance-conferring mutations that may arise, which could then be used to
develop a new treatment? And if so, has this been done before?

Re: Evolutionary selection technique to combat 'Superbugs'