【重磅新聞！劍橋大學發表溯源新冠病毒的研究報告: 最原始毒株普遍存在于美國，中國流行的是變異毒株】
報告原文鏈接：
https://www.cam.ac.uk/research/news/covi⋯igins?from=groupmessage&isappinstalled=0實錘了，新冠病毒起源于美國！
劍橋大學研究人員發表在《美國科學院院刊》(PANS)上一篇針對新冠病毒溯源的研究發現，目前全球感染的新冠病毒實際上并非是同一種，而是變異分化成A、B、C三種類型，并且這三種類型的病毒在全球分布范圍不同。
研究人員通過繪制2019年12月至今年3月新冠病毒的基因發展史，發現了上述三種不同但又密切相關的病毒類型;然后通過在全球范圍內收集的160份感染樣本發現了不同類型的新冠病毒在全球傳播的軌跡。
讓人比較意外的是，A型--最原始的毒株，被認為是從蝙蝠傳播到人類中的新冠病毒祖先--雖然最先在中國被發現，但卻在美國最為普遍，研究發現有三分之二的美國樣本感染A型病毒，但其中受感染的患者大多數來自西海岸，而非紐約--紐約目前為美國疫情的“震中”，B類毒株是中國境內（即武漢）以及東亞地區的主要類型，C類病毒是歐洲主要類型，且在中國大陸沒有發現此類型的樣本。
By using genetic network techniques, researchers from Cambridge, UK, and Germany have reconstructed “early evolutionary paths” of COVID-19 in humans. Researchers revealed three distinct “variants” of COVID-19, which they labeled as type ‘A’, ‘B’ and ‘C’ .The research has 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. 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.