Daily or Weekly Therapy with Resiquimod (R‐848) Reduces Genital Recurrences in Herpes Simplex Virus–Infected Guinea Pigs during and after Treatment

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Abstract
The effect of resiquimod (R-848), an immune-response modifier that is similar to imiquimod, on recurrent herpes simplex virus (HSV) was evaluated using the guinea pig model of genital herpes. Guinea pigs were intravaginally infected with HSV-2 and then were randomized on day 14 to receive nothing or 0.1 mL/kg per dose of subcutaneous resiquimod, given either daily, every other day, or weekly from days 15–35. During a 3-week course of therapy, recurrences in all 3 treated groups were reduced by >80%, compared with the control group. After therapy, recurrences remained significantly (P<.05) decreased in all 3 groups for the next 3 weeks. The group treated weekly developed the fewest recurrences. Significant increases in interleukin-2 levels, produced by incubation of mononuclear cells with HSV-2 antigens, but not in circulating antibody also were detected in the treated groups. Resiquimod treatment may offer significant advantages to present antiviral therapies for the control of recurrent genital herpes

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