准确的说是"13 different genetic sequences of the SARS-COV-2 virus from December 2019"，这个离开变异病毒还差了好长距离。RNA病毒天然不稳定，基本上每 传播一次都会出现少许gene sequence变化（比如SNPs)，只有这种变化积累到一定程度影响到了编码的蛋白才能称为变异病毒。下面是狗来的一个定义（没有太认真找）。
As a virus replicates, its genes undergo random “copying errors” (i.e. genetic mutations). Over time, these genetic copying errors can, among other changes to the virus, lead to alterations in the virus' surface proteins or antigens.
准确的说是"13 different genetic sequences of the SARS-COV-2 virus from
December 2019"，这个离开变异病毒还差了好长距离。RNA病毒天然不稳定，基本上每
传播一次都会出现少许gene sequence变化（比如SNPs)，只有这种变化积累到一定程度影响到了编码的蛋白才能称为变异病毒。下面是狗来的一个定义（没有太认真找）。
As a virus replicates, its genes undergo random “copying errors” (i.e.
genetic mutations). Over time, these genetic copying errors can, among other changes to the virus, lead to alterations in the virus' surface proteins or antigens.