Human intervention may have placed more severe selective pressure on the L type, which might be more aggressive and spread more quickly than the S type.

人为干预可能对L亚型施加了更大的选择性压力，如果没有这些干预，L亚型可能更具侵略性和扩散得更快速。

However, the authors highlighted the fact the data examined in the study is very limited. How L type strains evolved from S type, as well as how these mutations would affect the transmission and pathogenesis of the virus, are still unknown.

不过，论文作者也指出研究数据很有限。L型如何从S型演化而来，以及变异如何影响病毒传播和发病机制，依然是未知数。

Scientists also found most patients caught either the L or S type of novel coronavirus strain. But there might be exceptions to the rule that should be followed with further research. For example, the study said a 63-year-old female patient in Chicago had likely contracted both L and S types of novel coronavirus strains when she traveled in Wuhan and returned to the United States on Jan 13.

样本显示，大部分患者只感染了L亚型或S亚型中的一个。但其中一位近期有过武汉旅行史的63岁美国患者却很有可能同时感染了L型和S型新冠病毒。不过，该论文作者表示目前还无法排除新突变型的可能性。

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