It’s a microbe-eat-microbe world
Viruses infect more than just people. They infect bacteria, too. Some viruses (called bacteriophages) use bacteria as incubators. A virus attaches to a host bacterium and injects its genes, which tell the bacterium to make more viruses. Then the new viruses burst from the bacterium. Because these viruses kill their hosts, they may become a tool to fight bacterial infections.
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