Objectives: To describe the epidemiology of type specific recurrent genital herpes, and to compare the duration of recurrent genital lesions caused by herpes simplex virus (HSV) types 1 and 2. Methods: Participants were enrolled at clinics across the United States. Adults suspected of having active genital herpes were eligible. Lesions were cultured for HSV and typed. Data from 940 participants with recurrent culture positive HSV lesions were analysed. Pearson's x 2 and Fisher's exact tests, multivariate logistic regression models, and a stratified Cox proportional hazards model were used to compare epidemiological characteristics and lesion duration of HSV-1 and HSV-2. Results: HSV-1 was present in 4.2% of the recurrent HSV culture positive lesions. HSV-1 was most prevalent among whites (6.5%) and individuals with 0-2 recurrences in the previous year (9.1%) and, among men, in those with rectal/ perirectal lesions (13.2%). Longer lesion duration was not significantly associated with virus type (hazard ratio (HR) 0.95, 95% confidence interval (CI) 0.65 to 1.38, p = 0.79), but was associated with male sex (HR 0.85, 95% CI 0.74 to 0.99, p = 0.04), and HIV seropositivity (HR 0.62, 95% CI 0.48 to 0.81, p,0.01).
Conclusions:The authors found that, in the United States, recurrent genital HSV-1 is relatively rare in the STD and HIV clinic setting, especially among black people. Among men, rectal/perirectal recurrent lesions are more likely to be caused by HSV-1 than are penile lesions. In addition, lesion duration depends on sex and HIV status but not virus type. These findings shed new light on the type specific epidemiology of recurrent genital HSV, and suggest that type specific testing can inform the prognosis and management of genital herpes.G enital herpes, a disease marked by recurrent ulcerative lesions, is one of the most prevalent sexually transmitted diseases (STDs).1 2 Herpes simplex virus type 2 (HSV-2) is the most common cause, but recent reports suggest that an increasing share of genital herpes is caused by herpes simplex virus type 1 (HSV-1).
4Although primary disease is similar for both genital HSV-1 and HSV-2, 5 primary genital HSV-1 infection is less likely than HSV-2 infection to result in recurrent disease, 6 7 and the risk of asymptomatic viral shedding is less for patients with genital HSV-1.
8Little is known, however, about other epidemiological and clinical differences between recurrent genital HSV-1 and HSV-2.The objective of this study was to describe the epidemiology of type specific recurrent genital herpes in a large, geographically diverse sample, and to compare the duration of recurrent genital HSV-1 and HSV-2 lesions.
METHODS
Study designData were collected as part of a cross sectional surveillance study to assess the prevalence of aciclovir resistance in genital herpes.9 Participants were enrolled at 22 STD and HIV clinics in seven urban areas across the United States from October 1996 to April 1998. Eligible participants were 18 years and older and were suspected of having active geni...