Innate Immunity to Herpes Simplex Virus Type 2

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Abstract
Herpes simplex virus type 2 (HSV-2) is responsible for most cases of genital herpes and also can cause fatal disseminated disease in perinatally infected newborns. Sexually transmitted infections initiate in the skin or mucosa and quickly spread into peripheral nerves to establish latency. Innate immunity, the first line of defense during both primary and recurrent infection, is essential during this period of acute infection to limit initial viral replication and to facilitate an appropriate adaptive immune response. The innate immune response consists of a complex multilayered system of mechanical and secreted defenses, immediate chemokine and IFN responses, and rapidly recruited cellular defenses. HSV has devised equally elaborate strategies to evade or interfere with innate immunity. This review summarizes our current understanding of the innate immune responses to HSV-2 and the mechanisms by which HSV-2 can overcome these barriers. Newly emerging links between products of innate responses and the development of adaptive immune responses are also discussed.

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