BEIJING/MADRID, June 28: The presence of Covid-19 (coronavirus) in Spain's sewage offers a clue on the virus' existence, either in people or animals, before China reported its first Covid-19 patient in December 2019, Chinese experts said, after Spain detected the presence of the novel coronavirus in March last year, and Italy made similar findings, reports Global Times.
Research led by the University of Barcelona showed the presence of the virus in samples of wastewater in Barcelona in March 2019, and infections were present before knowing of any case of Covid-19 in any part of the world.
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