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The challenge here is to make the use of bacteriophages more widespread as a method of treating bacterial infections. I would also like to know what the potential effects would be. I would think that this would have a number of benefits over anti-biotics since the phages evolve with the bacteria, meaning that you don't get superbugs like you do through the overuse of anti-biotics.
Bonus points if you get this to happen without delaying the development of anti-biotics.