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For bacteriophages, or phages for short, don t hurt humans. Instead they infect bacteria, using them as hosts in order to reproduce, destroying them in the process.
Given what we now know about viruses and how potentially lethal they can be, the idea of inhaling or swallowing one to treat an infection sounds like the last thing we would want to do.
Drug-resistant infections are already an urgent medical concern. They are poised to be one of the most significant, if not the most significant, threats that humanity faces in the next