Genital herpes in a sexually-transmitted infection clinic in Singapore: a 1-year retrospective study.

INTRODUCTION This study describes the clinical features of genital herpes seen in a sexually-transmitted infection (STI) clinic in Singapore and the characteristics of the affected population. The distribution of herpes simplex virus (HSV) subtypes within the population, correlation of HSV culture result with duration of disease and prescribing habits of doctors were also examined. MATERIALS AND METHODS This is a retrospective study of cases of genital herpes seen at the Department of Sexually-transmitted Disease Control (DSC) clinic over a 1-year period. All records of clinically diagnosed HSV genital infections at the DSC clinic in 2001 were retrieved and reviewed and the data collated. RESULTS There were 324 cases of genital herpes, of which 153 (47.2%) were first-episode and 171 (52.8%) were recurrent HSV infections. There were 259 males and 65 females; their mean age was 35.2 years (range, 17 to 75 years). Of the 241 cases with positive culture results, 28 (11.6%) tested positive for herpes simplex virus type 1 (HSV-1) and 213 (88.4%) were positive for herpes simplex virus type 2 (HSV-2). HSV-1 accounted for 19.3% of first-episode and 4.7% of recurrent infections. HSV-2 accounted for 80.7% of first-episode and 95.3% of recurrent infections. Cultures taken from lesions < or = 4 days, between 5 and 7 days and > 7 days of onset were positive in 79.2%, 75.7% and 75% of cases, respectively. Oral acyclovir was prescribed more commonly in females (53.8%) than in males (21.6%). CONCLUSION Genital herpes is a common STI seen at the DSC clinic. HSV-2 is the most common cause of genital herpes and accounts for most of the recurrent cases seen.