Findings may improve HSV management
The current study helps fill a knowledge gap regarding the natural history of genital HSV-1 infections, Richard J. Whitley, MD, and Edward W. Hook III, MD, both of the University of Alabama at Birmingham, wrote in an accompanying editorial. Despite the small study population, the data represent the largest cohort to date of individuals with first-episode infection and up to 2 years’ follow-up.
Although HSV-2 shedding is greater and associated with more symptoms, seroprevalence of HSV-2 in the United States is declining, they noted. Therefore, the findings can inform patient counseling and recommendations for antiviral therapy that may extend to managing HSV-1 in pregnant women as well, although no pregnant women were included in the study.
“For clinicians, these data emphasize the importance of determining the HSV viral type in persons presenting with initial episodes of genital herpes to accurately counsel patients regarding risk of clinical recurrence, the likelihood of asymptomatic shedding of virus and hence transmission, and antiviral prophylaxis,” the editorialists emphasized. For investigators, the results should prompt additional studies of the host defense against HSV and improved serological testing.
Study supports need for attention to HSV-1
“Genital herpes is an extremely common sexually transmitted infection, and often only HSV-2 is measured,” Sarah W. Prager, MD, of the University of Washington, Seattle, said in an interview. “This study shows that HSV-1 also accounts for a significant amount of genital disease, and should also be considered when determining prevalence of genital herpes.
“I was not surprised to see that viral shedding decreased significantly over the first year after diagnosis, and similarly not surprised that lesions were rare after the initial infection,” said Dr. Prager, who was not involved in the study. “I was somewhat surprised to see that genital HSV-1 shedding was more common than oral shedding.”
Dr. Prager said that she would advise clinicians against serum HSV testing unless someone has an active genital lesion. “Testing after a lesion will often reveal HSV-1, and patients should be counseled that shedding will decrease over the first year. Subsequent genital lesions are uncommon, but certainly possible, and oral lesions and shedding are both rare.” ]
More research is needed in a more diverse population, Dr. Prager emphasized. Following patients for more than a year and learning more about the use of antiviral medications also would be useful.
The study was supported in part by the National Institutes of Health/National Institute of Allergy and Infectious Diseases through grants to several authors, including lead author Dr. Johnston. Dr. Johnston also disclosed personal fees from AbbVie, grants from Gilead, royalties from UpToDate, and personal fees from GlaxoSmithKline unrelated to the current study. Dr. Whitley disclosed personal fees from Virios Therapeutics as a board member and shareholder during the conduct of the study, royalties from Aettis unrelated to the submitted work, and serving on an advisory board for Visby Diagnostics. Dr. Hook disclosed serving on an advisory board for Visby Diagnostics unrelated to the submitted work. Dr. Prager had no conflicts to disclose and serves on the editorial advisory board of Ob.Gyn News.