| 摘 要： | Many viruses establish life-long infections in their natural host with few if any clinical manifestations. The relationship between virus and host is a dynamic process in which the virus has evolved the means to coexist by reducing its visibility, while the host immune system attempts to suppress and eliminate infection without damage to itself. We are now beginning to understand that viruses can employ a variety of strategies to evade host immune responses. These include escape from T cell recognition, resistance to
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