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In early April, a paper published in the journal Proceedings of the National Academy of Sciences of the United States of America (PNAS) raised the eyebrows of a number of genomic epidemiologists It suggested that there were three distinct variants of the novel coronavirus, SARS-CoV-2, spreading in different regions of the world—one predominantly in Australia and North America, one in China, and one in Europe It also suggested that the variant circulating in North America and Australia was older than the one that appeared in Wuhan, China, at the end of December (Proc Natl Acad Sci U S A 2020, DOI: 10 1073/pnas 2004999117) If this were true, the outbreak of COVID-19, the disease caused by the virus, would have started outside Wuhan, which contradicts scientific consensus Some genomic epidemiologists, who track the genomes of pathogens to understand how diseases spread, thought that although the data the PNAS paper used were sound, the paper’s analytical View: PDF ;Full Text HTML
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