Valacyclovir and acyclovir for suppression of shedding of herpes simplex virus in the genital tract

The Journal of Infectious Diseases
Rachna GuptaLawrence Corey

Abstract

Valacyclovir exhibits better oral absorption and higher, more prolonged serum concentrations than oral acyclovir. The efficacy of valacyclovir and acyclovir on genital herpes simplex virus (HSV) shedding was assessed in a double-blind, 3-period crossover trial. Sixty-nine immunocompetent participants with genital HSV-2 received oral valacyclovir, acyclovir, and matching placebo in random order for 7-week periods. Participants provided daily genital mucosal swabs for HSV detection by viral culture and polymerase chain reaction (PCR). HSV was detected at least once in 62 (90%) participants by culture and in 68 (98%) by PCR. During placebo, the total HSV shedding rate was 15.4% of days by culture (PCR, 40.2%); the subclinical shedding rate was 6.6% by culture (PCR, 27.1%). Both antivirals were associated with lower HSV shedding by culture (relative risk [RR], 0.03 [95% confidence interval [CI], 0.01-0.07] for valacyclovir and RR, 0.05 [95% CI, 0.03-0.10] for acyclovir) and PCR (RR, 0.18 [95% CI, 0.12-0.26] for valacyclovir and RR, 0.20 [95% CI, 0.15-0.28] for acyclovir), compared with placebo. No significant differences in frequency and quantity of HSV were detected by PCR between the valacyclovir and acyclovir arms. Although the ...Continue Reading

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