herd immunity

COVID-19

1 in 10 Maricopa County residents have likely had COVID-19, new study finds

The number of COVID-19 infections in Arizona’s most populous county probably is far higher than what official counts show, according to a survey that found 1 in 10 residents have likely had the novel coronavirus that causes the disease. As health experts worry about a new spike in infections, a study by the Maricopa County

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