COVID was detected in Barcelona's sewage from March 2019 https://www.reuters.com/article/us-health-coronavirus-spain-science-idINKBN23X2HQ …https://twitter.com/oriwa_/status/1404960837069012999 …
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It's from the comments but FYI: "The authors of the paper have now published a second study that states their earliest positive sewage sample is from January 15th 2020 and does not make any reference to this preprint:"https://www.medrxiv.org/content/10.1101/2020.06.13.20129627v1 …
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Most likely a contamination of the current SARS-CoV2 in the sewer sample by something or someone in the lab. At least you need to sequence that sample. The sequence will tell you if it is ancestral. If not, then it is a current contaminant. Phylogenomics is not gonna lie.
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They published a paper later saying their earliest positive sample was from January, so I'm guessing they failed to correct the preprint. They got it only for two pol sites in the 39th cycle too, so it could easily be nonspecific amplification of a closely related Cov.
End of conversation
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