https://www.medrxiv.org/content/10.1101/2020.06.13.20129627v1 -- SARS-CoV-2 was detected in Barcelona sewage long before the declaration of the first COVID-19 case, indicating that the infection was present in the population before the first imported case was reported.
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Из того же источника
https://www.medrxiv.org/content/10.1101/2020.06.13.20129627v1 -- SARS-CoV-2 was detected in Barcelona sewage long before the declaration of the first COVID-19 case, indicating that the infection was present in the population before the first imported case was reported.
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