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SARS-CoV-2 cases and suspected reinfections, Clark County, Nevada, USA, March 2020–March 2022. Dotted lines show timeframe for identification of Alpha, Delta, and Omicron SARS-CoV-2 variants in Clark County. New cases were defined as a first positive SARS-CoV-2 PCR test for a person. Suspected reinfections were defined as a second positive SARS-CoV-2 PCR test collected >90 days after a person’s first positive PCR test.
