人免疫缺陷病毒(HIV)的确切年龄虽然不明,但研究人员试图根据病毒的变异性来估计HIV类的年龄。美国Los Alamos国立实验室的理论科学家 Ge-rald Myers应用计算机模型估价2种主要病毒HIV-1和HIV-2从共同祖先分化所用的时间。他认为最为45年,平均为45±3年。上述估计的问题是Myers假设突变率是持久不变的,但正如进化论的生物学家所知,突变率不能保证永久不变。微生物的变化率取决于周围环境选择作用 Although the exact age of the human immunodeficiency virus (HIV) is unknown, researchers are trying to estimate the age of the HIV class based on the variability of the virus. Ge-rald Myers, a theoretical scientist at Los Alamos National Laboratory in the United States, used a computer model to estimate the time it takes for two major viruses, HIV-1 and HIV-2, to differentiate from a common ancestor. He considered the most 45 years, with an average of 45 ± 3 years. The above estimated problem is that Myers assumes that the mutation rate is constant, but as the evolutionary biologists know, the mutation rate can not be guaranteed to be permanent. The rate of change of microorganisms depends on the surrounding environment