There is a tantalising new clue in the hunt for the origins of the COVID-19 pandemic. 9News
The analysis had not been made public until today, when it was posted online as a preprint study, ahead of peer review.
Scientists don't know whether the virus that causes COVID-19 can infect every species they identified in the samples.Raccoon dogs are of particular interest because other studies have shown that they can be infected, they shed a lot of virus when they get sick, and they can transmit the infection to uninfected animals.
Indeed, there were a few positive specimens from other parts of the market that contained only human DNA, suggesting that humans were shedding the virus there. Chinese scientists posted their own analysis of the sampling as a preprint study in February 2022 but did not mention genetic sequences from non-human animals in the environmental swabs.
Scientists had cautioned for more than a decade that these markets had the potential to start pandemics, and before the COVID-19 pandemic, the Chinese government had done little to rein in this type of trade. Previous studies provided evidence that the virus probably emerged naturally in the market but could not point to a specific origin.
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