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Researchers devised a new way of analyzing wastewater to monitor the prevalence of different SARS-CoV-2 variants over time (shown here for San Diego, from September 2021 to May 2022).

Researchers devised a new way of analyzing wastewater to monitor the prevalence of different SARS-CoV-2 variants over time (shown here for San Diego, from September 2021 to May 2022). Credit: SEARCH alliance