日志
科学日报直指病毒源头来自美国，美国有A类基因源头病毒
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Researchers from Cambridge, UK, and Germany have reconstructed the early "evolutionary paths" of COVID-19 in humans -- as infection spread from Wuhan out to Europe and North America -- using genetic network techniques.
Forster and colleagues found that the closest type of COVID-19 to the one discovered in bats -- type 'A', the "original human virus genome" -- was present in Wuhan, but surprisingly was not the city's predominant virus type.
Mutated versions of 'A' were seen in Americans reported to have lived in Wuhan, and a large number of A-type viruses were found in patients from the US and Australia.
Wuhan's major virus type, 'B', was prevalent in patients from across East Asia. However, the variant didn't travel much beyond the region without further mutations -- implying a "founder event" in Wuhan, or "resistance" against this type of COVID-19 outside East Asia, say researchers.
The 'C' variant is the major European type, found in early patients from France, Italy, Sweden and England. It is absent from the study's Chinese mainland sample, but seen in Singapore, Hong Kong and South Korea.
下面是完整的原文链接：
https://www.sciencedaily.com/releases/2020/04/200409085644.htm
