自然界的任何物种,包括人类本身都存在变异,变异是生物适应环境和维持生存的一种重要方式,是生物进化的规律。但不同物种变异速率不一,病毒是变异率比较高的微生物。一方面病毒的复制频率很高,遗传物质很容易在复制过程中发生突变;另一方面病毒在宿主 Variants exist in any species in nature, including human beings themselves. Mutation is an important way for a living organism to adapt to the environment and maintain its existence. It is a law of biological evolution. However, the rate of variation of different species varies, the virus is a relatively high rate of mutation of microorganisms. On the one hand the high frequency of virus replication, genetic material is very easy to mutation in the replication process; the other hand, the virus in the host