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Phage would be useful but bacteria are likely to be able to resist engineered phage as well.

https://www.ncbi.nlm.nih.gov/pubmed/23819105




The abstract states the opposite of the parent. It says that while bacteria develop resistance in the lab to phases that co-evolve, it is unlikely to be a problem in the real world.

>Bacteriophage therapy, the use of viruses that infect bacteria as antimicrobials, has been championed as a promising alternative to conventional antibiotics. Although in the laboratory bacterial resistance against phages arises rapidly, resistance so far has been an only minor problem for the effectiveness of phage therapy. Resistance to antibiotics, however, has become a major issue after decades of extensive use. Should we expect similar problems after long-term use of phages as antimicrobials? Like antibiotics, phages are often noted to be drivers of bacterial evolution. Should we expect phage-treated pathogens to develop a general resistance to phages over time, a resistance against which only, for example, hypothetically co-evolved phages might be infective? Here we argue that the global infection patterns of phages suggest that this is not necessarily a concern as environmental phages often can infect bacteria with which those phages lack any recent co-evolutionary history.




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