If phages do get into our tissues, what—if anything—do they do there? Only a few studies address the issue. In 2004, researchers led by Dąbrowska reported that a specific type of phage can bind the membrane of cancer cells, reducing tumor growth and spread in mice. A few years later, Dąbrowska’s graduate adviser, phage expert Andrzej Gorski, showed that phages can affect the mouse immune system when injected, ramping down T-cell proliferation and antibody production. In mice, they can even prevent the immune system from attacking transplanted tissues.
https://www.sciencemag.org/news/2017/11/does-sea-viruses-inside-our-body-help-keep-us-healthy
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