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    HomeCountries ponder wider wastewater testing amid hope airports offer China COVID-19 cluesFILE PHOTO: Lab technicians test wastewater for COVID-19 at Biobot

    FILE PHOTO: Lab technicians test wastewater for COVID-19 at Biobot

    FILE PHOTO: A lab technician tests wastewater samples from around the United States for the coronavirus disease (COVID-19) at the Biobot Analytics, in Cambridge, Massachusetts, U.S., February 22, 2022. REUTERS/Allison Dinner

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