全世界每三人中就有将近一人感染乙肝病毒(约20亿人)，而每十二人中就有一人(5.2亿多人)的生活与慢性乙型肝炎或慢性乙肝病毒感染相伴。
Nearly one out of every three people in the world (approximately 2 billion people) has been infected by HBV, and one in twelve (more than 520 million people) live with chronic HBV or HCV infection.
例如，在慢性乙型肝炎病毒和艾滋病病毒治疗期间发生艾滋病毒感染和耐药变异时CXCR 4向性病毒的出现可作为这种持续演变的表型证据。
Phenotypic evidence of this continuing evolution is seen, for example, in the emergence of CXCR4 tropic viruses during HIV infection and drug-resistant variants during chronic HBV and HIV therapy.
例如，在慢性乙型肝炎病毒和艾滋病病毒治疗期间发生艾滋病毒感染和耐药变异时CXCR 4向性病毒的出现可作为这种持续演变的表型证据。
Phenotypic evidence of this continuing evolution is seen, for example, in the emergence of CXCR4 tropic viruses during HIV infection and drug-resistant variants during chronic HBV and HIV therapy.
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