For one, the vaccine certainly does not save lives. It lessens the severity of the disease, which is a huge plus but not enough of a benefit to mandate vaccinations. (Who wants to be hospitalized?) Secondly it is obvious that natural antibodies protect a person from getting re-infected, but still, that protection wears off after about a year, depending on the individual. I know many people with antibodies who subjected themselves to sick coronavirus patients to help them, and of coarse they did not get re-infected, and I know people who were re-infected.
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