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Grafiki, kuri atspoguļo notekūdeņos konstatēto COVID apjomu (PCR testi, tiesa) Bostonā - https://www.mwra.com/biobot/biobotdata.htm, Santa Klārā (tā rakstās, ja?) - https://covid19.sccgov.org/dashboard-wastewater, LA - https://www.lacsd.org/home/showdocument?id=4318