This is news from University of Arizona in the USA: https://tucson.com/news/arizona_news/university-of-arizonas-wastewater-testing-halts-potential-surge-in-covid-19-cases-at-dorm/article_e29a25ef-b1d2-5da7-8b8d-1ea3b3f166ea.html#tracking-source=home-trending I find this fascinating, as during the original SARS outbreak of 2003, it was determined that the outbreak was fomented by a malfunctioning toilet system in an apartment building in Hong Kong! https://www.infectioncontroltoday.com/view/sars-and-plumbing-role-sewage-plays-spreading-disease - https://www.infectioncontroltoday.com/view/sars-and-plumbing-role-sewage-plays-spreading-disease "According to WHO, ineffective U-trap seals in the drainpipes of Amoy Garden apartments triggered the SARS outbreak. These traps, often called P-traps in the U.S., are designed to hold water at all times. The water acts as a barrier and prevents insects, foul smells and, in this case, viruses and bacteria from backing up through the drains.
"Every U.S. plumbing fixture -- a toilet, sink, bathtub or floor drain -- uses a P-trap in its drainpipe. When the P-trap failed in the Amoy Garden apartment complex in Hong Kong, the plumbing system, in effect, acted as a transportation system for the virus to spread quickly through the building," said Larry Rothman, master plumber with Roto-Rooter Services Company.”
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