phages = bacteriophages = viruses that kill bacteria [1] There's an arms race between bacteria and humans: bacteria infect humans → humans develop antibiotics

phages = bacteriophages = viruses that kill bacteria [1] There's an arms race between bacteria and humans: bacteria infect humans → humans develop antibiotics to kill bacteria → bacteria evolves resistance against antibiotics → humans develop new antibiotics to kill resistant bacteria → bacteria evolves resistance to new antibiotics → ... Developing more and more new antibiotics for resistant bacteria is slow and expensive. Bacteriophages (viruses that infect bacteria) on the other hand would naturally evolve with the bacteria, like how COVID evolved new strains in response to our vaccines. [1] https://en.wikipedia.org/wiki/Phage_therapy https://en.wikipedia.org/wiki/Phage_therapy