换一批摘要篇首： The natural historv of HIV is defined as the untreated progression from the time of HIV transmission to death.1 The typical course of infection is characterized by three phases: acute or primary infection phase, the asymptomatic phase, and AIDS. Primary infection is often accompanied by a symptomatic acute retroviral syndrome starting 2-3 weeks after transmission and lasting an additional 2-4 weeks.1,2
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