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Virus Hunters Sift Through Sewage to Detect Covid-19 Hotspots

  • Asymptomatic cases mean other modes of detection needed
  • Dogs are being trained to smell odor changes from infection
Scientists insert a rubber tube into the manhole outside a workers’ dormitory in Singapore to collect wastewater samples.
Scientists insert a rubber tube into the manhole outside a workers’ dormitory in Singapore to collect wastewater samples.Photographer: Faris Mokhtar/Bloomberg
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Wearing face shields, masks, two layers of gloves and navy cotton overalls, two scientists carefully lift off a metal manhole cover to reveal the cumulative waste of some 400 migrant workers.