THE SCOOP ON POOP — Just days after students got back to campus the last week of August, the University of Arizona stopped a Covid outbreak by testing the wastewater in their dorms. Yep, wastewater — all the dirty stuff from the toilets, showers, sinks, washing machines, dishwashers, you name it. Think, the grossest swimming pool you could imagine. Every morning, around the time the majority of students take a shower or relieve themselves after a night’s sleep, a member of the university’s wastewater testing team removes a 250-pound manhole cover outside of a dormitory and gathers a wastewater sample from the sewer, said Ian Pepper, director of the Water and Energy Sustainable Technology Center at Arizona. The samples are taken to a lab to separate the virus from everything else in the wastewater. After Pepper’s team found traces of Covid that first week, the university tested all 311 of the building’s residents and employees. The tests found two asymptomatic students. The university moved them to a quarantine dorm before a larger outbreak occurred. Wastewater-based epidemiology has been used to identify polio outbreaks. Now universities across the country like Arizona, Syracuse and Louisiana State University are using it to try to detect Covid. Days before signs of illness, people shed the virus in their waste, so finding Covid in the wastewater can provide “seven precious days for intervention,” Pepper said. The tests are being used beyond college campuses. LSU, which is working on a system for testing the wastewater in its on-campus buildings, started by testing wastewater for 220,000 residents in Baton Rouge this summer. In early June, as Louisiana’s case rate was tapering off, Gov. John Bel Edwards moved the state into Phase 2 of reopening. “Fourteen days exactly after Phase 2 reopened, the virus levels in the wastewater spiked, hundreds of times,” said John Pardue, an LSU professor of civil and environmental engineering. When Edwards issued a mask mandate in July, the concentration of virus in the wastewater plummeted, Pardue said. A nationwide wastewater surveillance system would have helped the U.S.’s pandemic response, said David Larsen, an epidemiologist and public health expert at Syracuse University. “The Chinese CDC released the genome in January,” Larsen said. A wastewater test in the pandemic’s first months could have served as an early-alert system for where the virus was spreading, he said. “You could immediately say, we have it in these cities. We don’t in these cities.” When used to survey an area larger than a college dorm, the data can’t tell you which households have the virus. But wastewater data has shown officials in Stafford County, Va., that Covid is more widespread than they originally thought, said Jason Towery, the county’s director of public works. Not knowing how to use the data is one of the barriers facing a nationwide wastewater surveillance system, Larsen said. But with a vaccine at least a year away, he said, it is likely to become an important tool for monitoring Covid trends. “Confirming that it’s under control and public confidence that it’s under control,” Larsen said. “That would be huge to get us back to work.” To have a wastewater surveillance point with twice-weekly tests in every ZIP code in the U.S. would cost the government $3 billion annually, Larsen estimates. “It’s really not much. The cost per person monitored is like $10, if that, a year.” The CDC and HHS are working on a national wastewater surveillance system and data portal. The data will be collected from local and state governments willing to provide it, and it will be up to the participants to find partners for sample collection and testing. A nationwide wastewater-testing program that can test for a broad base of pathogens, including the coronavirus, could have been up and running in the U.S. in March, Larsen said. “My kids would be in school right now. Our economy would not have tanked the way that it has.” Welcome to POLITICO Nightly: Coronavirus Special Edition. Reach out rrayasam@politico.com or on Twitter at @renurayasam.
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