As new coronavirus variants dominate COVID-19 cases in Chicago, researchers said they were able to detect the presence of the omicron BA.2 subvariant two weeks before it showed up in an individual clinical COVID test by using tampons planted in sewers around the city.
A Moore swab containing a tampon just before it's lowered into a Northwest Side sewer to test wastewater for the presence of COVID-19 and variants on July 21, 2022.intersection of Clifton Avenue and Broadway, Evan Berkowitz and John Leavell pulled a small steel cage the size of a coffee cupInside the cage: a tampon, bloated and sodden with wastewater.Beyond covering menstrual needs, tampons have been famously used to stop nosebleeds and dress emergency wounds.
John Leavell recovers a Moore swab containing a tampon from an Uptown sewer to test wastewater for the presence of COVID-19. When they return, they replace the sample with a fresh tampon and take it to a UIC microbiology lab — where the sample is tested for the coronavirus — and to Argonne National Laboratory for genetic sequencing to figure out what variants of the virus are present. Samples are collected twice weekly.
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