Herd immunity apparently does not work with this virus. I say apparently because, like almost everything about this new virus, it is not known for sure. It is becoming common belief among professionals that you can get it more than once and that the presence of antibodies does not indicate immunity. And there are some scientists who point out that there may not be an effective vaccine for many years based on the fact that some other coronaviruses do not have effective vaccines despite many years of research and effort.
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