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Asymptomatic herpes simplex virus (HSV) shedding was described in a cohort of human immunodeficiency virus (HIV)-infected women, and the association of HSV shedding with changes in plasma HIV RNA load was investigated. Genital, rectal, and oral swabs were obtained daily during a 4-week period for polymerase chain reaction and culture, and concomitant plasma specimens were drawn 3 times weekly for determination of HIV RNA load. During the study, 70% and 79% of subjects shed HSV from the oral cavity and genital area, respectively. Shedding of HSV occurred for a mean of 3.2 days for oral shedding and 5.4 days for genital shedding. Mean plasma HIV RNA loads during periods of HSV shedding and nonshedding and for periods 3 days after the cessation of shedding were compared; no significant differences were found (P=.74). In women who shed HSV, as evaluated by detection of virus, plasma HIV RNA load did not fluctuate with HSV shedding. [ABSTRACT FROM AUTHOR]