【剑桥大学发表关于新冠病毒的变种和传播路径研究报告】 报告指出，在160份完整的检测样本中，发现新冠病毒三个变种A、B、C: A类和从蝙蝠、穿山甲身上提取的病毒最为相似，这种A类病毒变种据称在武汉居住过的美国人身上发现，并且在美国以及澳大利亚感染者上也发现了大量A类病毒，但是却不是武汉当地主要的病毒类型。B类毒株是中国境内（即武汉）以及东亚地区的主要类型。C类病毒是欧洲主要类型，且在中国大陆没有发现此类型的样本。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.原文链接：http://t.cn/A6wZoEUA