Many bacteria live inside your body all the time. An adult human contains more bacteria cells than human cells (many bacteria are small). It’s a mode of survival as a germ, don’t give the host a disease and its immune system won’t boot you out. If a virus hijacks only a few cells, it won’t stimulate a response and it can make many copies. Get greedy, and you get a response and t_e body builds immunity against future invasions.
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