For one, the vaccines work well but they haven’t been injected into nearly enough people to stop the virus’s spread, even in the more vaccinated areas. Areas previously hit hard by the virus, mostly on the South and West sides, also may have higher levels of natural immunity — which is waning, and not nearly enough to stop a surge there, but perhaps can keep it from growing as fast.
COVID-19 cases are up in more vaccinated parts of Chicago. One possible reason: People are dropping their guard.

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