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Abstract
Herpes simplex virus (HSV) causes productive and latent forms of infection in humans and experimental animals. The primary infection and reactivation of the latent infection evoke an immune response in the host organism, involving activities of macrophages, CD4+ and CD8+ lymphocytes, and B lymphocytes. Strong cytokine responses are associated with the acute and recurrent phases of HSV infection. Also, during the latent phase of HSV infection in the senory ganglia, expression of certain cytokines can be detected. The cytokine response to HSV infection is dominated by proinflammatory and Th1 type cytokines; however, Th2 type cytokines such as interleukin-4 also are expressed in the infected tissue. The use of novel HSV-derived, cytokine-expressing gene therapy vectors necessitates studies on the possible modulation of the host responses by the virus-encoded cytokine transgenes. This review focuses on the roles of certain Th1 and Th2 type cytokines in different phases of the experimental HSV infections.