Recently, scientists have uncovered a new weapon that bacteria use to protect themselves from destruction - vi secretion. Vi secretion is a process in which a specific type of bacterium releases a protein that acts as a defense mechanism against other bacteria, viruses, and even human cells. This protein is capable of disrupting the normal functioning of the invading bacteria or virus, thereby stopping it from replicating and causing disease. In some cases, the protein even kills the invader. It’s an incredibly effective defense system and could be used to fight off infections or even to prevent the spread of certain diseases.

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source: Phys.org