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The two cases that have been identified at the university were both asymptomatic, and Pepper said wastewater testing could be sensitive enough to detect the coronavirus up to a week before a person develops symptoms.“So, you have seven precious days in which you can undergo intervention,” he said.Pepper’s team is conducting regular tests of sewage from 20 buildings across campus, including dorms and the university’s student union center.If a sample comes back positive for the coronavirus, the school’s protocol is to then test everyone who lives or works in the building using traditional nasal swabs or antigen tests that are designed to detect viral proteins.
As said here by Denise Chow