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Clinical Course of Patients With Serologic Evidence of Recurrent Genital Herpes Presenting With Signs and Symptoms of First Episode Disease

Diamond, Catherine MD*†; Selke, Stacy MA; Ashley, Rhoda PhD; Benedetti, Jacqueline PhD§; Corey, Lawrence MD*†‡

Sexually Transmitted Diseases: April 1999 - Volume 26 - Issue 4 - p 221–225
Original Articles
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Background and Objectives: The care of patients with first episode and recurrent genital herpes differs with respect to therapy and source partner evaluation. Of 498 persons who presented with what appeared by history and symptoms to be a first episode of genital herpes, we identified 41 who had serologic evidence of remotely acquired herpes simplex virus 2 (HSV-2) infection.

Goals: To define the natural history of these individuals with previously unrecognized HSV-2 and to evaluate if any clinical or historical features could differentiate these people from persons with true first episode infection.

Study Design: Observational cohort study.

Results: Clinical overlap existed in the frequency of local symptoms, fever, and size of genital lesions between those with remotely acquired versus recently acquired genital herpes. The frequency of new sexual partners and recent sexual history were also similar in the two groups. However, on follow-up, the lesions of persons with remotely acquired HSV-2 healed more rapidly and subsequently recurred less frequently than those of true primary HSV-2.

Conclusions: Even in a referral clinic with experienced clinicians, almost 10% of persons who are judged to have first episode genital herpes have evidence of remotely acquired HSV-2, suggesting that clinical differentiation of first episode genital herpes from previously acquired infection is difficult. Type-specific serologic testing assists the clinician in correctly classifying the infection and determining the potential source partner.

*From the Departments of Medicine, Laboratory Medicine, and §Biostatistics, University of Washington, and Program in Infectious Diseases, Fred Hutchinson Cancer Research Center, Seattle, Washington

Supported by NIH Grant AI-30731.

Correspondence: Lawrence Corey, MD, Program in Infectious Diseases, 1100 Fairview Avenue North, Room D3-100, P.O. Box 19024, Seattle, WA 98109-1024. E-mail: lcorey@u.washington.edu

Received for publication August 26, 1998, revised November 11, 1998, and accepted November 18, 1998.

MORE THAN 20% OF ADULTS in the United States have serologically demonstrated herpes simplex virus 2 (HSV-2) infection.1 Most of these infections are clinically unrecognized and undiagnosed.1–4 Even individuals with symptomatic genital ulcerations may not recognize their symptoms as those of genital herpes.5 Herpes simplex virus 2 is a disease of short incubation and, as such, most persons with first episode HSV-2 can identify partners from whom they might have acquired the infection.6–8 In contrast, recurrent HSV-2 is caused by endogenous reactivation of latent virus, an event that is not necessarily related to current sexual behavior or partners.9–10 During the course of a series of studies on the natural history of acquired genital herpes9,11,12 we encountered 41 patients who presented with a clinical history and signs and symptoms of first episode genital herpes and who denied a history of genital ulceration, but who were retrospectively determined by serologic testing to have recurrent disease. This report defines the natural history of these patients with recurrent HSV-2 who presented with first episode signs and symptoms.

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Methods

In 1974, the University of Washington Virology Division established a research clinic dedicated to the study of genital HSV. We have previously reported the clinical manifestations and course of genital HSV in a cohort of 457 individuals who presented to this clinic with symptoms and signs of first episode genital HSV; all had serologic evidence of recently acquired first episode HSV infection.9 During this period, we also identified 41 persons who clinicians thought had first episode genital herpes but were found on initial serologic testing by Western blot to have a full complement of HSV-2 specific antibodies at study entry. As it requires at least three months to develop such a Western blot profile, this serologic pattern indicates that these individuals had previously acquired subclinical HSV-2 and that their attendance at the clinic was their first recognizable attack.13–17

The patient recruitment and data collection methods have been described previously.9,11,12 Adult volunteers who presented at the University of Washington virology research clinic with what, by history and symptoms, appeared to be their first historical and clinically evident episode of genital herpes were enrolled. At enrollment, we obtained informed consent, performed standardized interviews and genital exams, and collected sera for HSV antibody testing. Patients were then followed at 2- to 3-day intervals until lesion healing occurred. They were requested to return to the clinic at the time of recurrence.

Convalescent sera were drawn 6 weeks after entry and at subsequent 3- to 6-month intervals. Sera were tested by Western blot for HSV-1 and HSV-2 antibodies. Criteria for defining the presence of HSV-2 have been published.13–16 All subjects in this cohort had a full set of bands to HSV-2 in their enrollment sera with no increase in number or intensity in convalescent sera, a hallmark of previously acquired HSV infection. The acute and convalescent sera were run together and were not made available to the clinicians until more than 6 months after enrollment. Viral isolation and typing were performed as previously described.18 All subjects had HSV-2 isolated from genital lesions.

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Statistical Analyses

The 41 subjects identified in this cohort were compared with the patients enrolled in the same protocol in whom subsequent serologic testing revealed true primary HSV-2 or with those with prior HSV-1 who acquired first episode HSV-2.9 Statistical analysis was performed using SPSS version 7.5 (SPSS, Inc., Chicago, IL).

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Results

The demographic characteristics of the 41 patients with recurrent HSV 2 with first episode symptoms are described in Table 1. Data for 326 primary HSV-2 and 59 nonprimary initial (NPI) HSV-2 cases are provided for comparison.9 The cases of recurrent HSV-2 with first episode symptoms tended to be in older patients who had had more lifetime sexual partners and earlier sexual debuts than those with true primary HSV-2 (Mann Whitney U, p < 0.05). These patients also had a greater lifetime number of sexual partners than individuals with prior HSV-2 who had recently acquired HSV-2 (nonprimary first episode or nonprimary initial HSV-2) (Mann Whitney U, p < 0.05). However, there was no significant difference in the age at presentation or age at sexual debut between the cases of recurrent HSV-2 with first episode symptoms and NPI cases. There was overlap in these parameters in all three groups. The median number of days between the last sexual encounter and presentation was similar in all three groups (4 to 5 days). Therefore, the past and immediate sexual history did not allow any discrimination between the three groups.

TABLE 1

TABLE 1

Local and systemic signs and symptoms were common among this cohort of patients (Figures 1A and B); 88% reported genital pain, 77% described pruritus, 69% complained of dysuria, and a vaginal or urethral discharge was evident in 53% of subjects. Inguinal adenopathy was documented in 52% of subjects. Fever during the episode was reported by 43%, 15% reported photophobia, and 40% had headache. Fifteen percent had meningismus and 22% had pharyngitis. Overall, 44% of the 41 patients had at least one systemic symptom. This contrasts with 73% of the patients with primary HSV-2 and 54% of the patients with NPI.

Fig. 1

Fig. 1

When evaluated by clinical signs and symptoms, patients with primary HSV-2 significantly differed from patients with recurrent HSV-2 with first episode symptoms only in the frequency of adenopathy and the overall frequency of constitutional symptoms. Primary HSV-2 patients were more likely to have adenopathy (chi-square, p = 0.01) and at least one systemic symptom (chi-square, p < 0.005). There was no significant difference in the frequency of systemic complaints between those with recurrent HSV-2 with first episode symptoms and those with nonprimary initial HSV-2.

Measurements of median lesion area, duration, and number are shown in Figures 2A, B, and C. Individuals with recurrent HSV-2 with first episode symptoms had significantly fewer lesions than those with primary HSV-2 (Mann Whitney U, p = 0.01) and a significantly shorter lesion duration (Mann Whitney U, p = 0.005). However, there was no significant difference in the median lesion area between the two groups. There were no significant differences in lesion area, number, or duration between patients with recurrent HSV-2 with first episode symptom cases and patients with NPI.

Fig. 2

Fig. 2

The patients with recurrent HSV-2 with first episode symptoms were followed a median of 433 days from enrollment (range: 60-1418). The first-year recurrence rate was 0.25 herpes outbreaks per month (range: 0-1.08); and the subsequent recurrence rate was 0.24 herpes outbreaks per month (range: 0-0.93) throughout the course of the study. This rate of recurrence was significantly less than the recurrence rates in the patients with primary and NPI HSV-2 (Mann Whitney U, p < 0.05).

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Discussion

We describe 41 patients who presented with symptoms of first episode genital herpes and denied histories of genital HSV, who were later determined by serologic testing to have recurrent HSV-2. These patients had a high frequency of systemic symptoms, had lesion areas similar to those in cases of true first episode genital herpes, and gave a similar history of sexual activity. These individuals were subsequently shown to be older, with a greater number of lifetime sexual partners and a longer period since sexual debut, than patients with true primary HSV-2. In addition, they healed their lesions more rapidly than persons with true primary HSV-2 acquisition. However, these differences in historical features and natural history would be of limited clinical utility to use prospectively on an individual case basis.

This analysis shows the difficulty of determining the time of acquisition of genital herpes by any clinical or historical information. This cohort of 41 patients represents 8% of the volunteers who presented to our research clinic with genital herpes and were judged by our clinicians to have a newly acquired case of the disease. Moreover, these 41 persons represented more than one third of the persons who had nonprimary clinical first episode infections. Serologic testing retrospectively showed that these patients had acquired HSV-2 at least 3 months before presentation, similar to the findings of Bernstein et al.17 These data demonstrate the often overlapping clinical severity of this infection; some recurrences of genital herpes are quite severe and can be associated with systemic symptoms and large lesional areas. Previous studies have demonstrated an average of less than eight lesions in typical cases of recurrent HSV-2, with a mean area of approximately 60 mm and duration of 10 days.19 This is in contrast to the median lesion number of 9, area of 125 mm, and duration of 15 days in these patients with recurrent HSV-2 who presented with first episode symptoms.

The phenomenon of recurrent genital herpes presenting with primary disease symptoms is clinically important. A patient initially presenting with genital herpes often seeks to blame his or her current partner as the source of the disease, resulting in recriminations, extensive medical evaluations, and even legal action. Our data suggest that recurrence may mimic primary disease and that such assigning of blame may be precipitous. We recommend that all patients with first episode infections get serologic and virologic typing. Matching of acute sera and viral type allows the clinician to determine whether genital HSV infection is primary or recurrent and appropriately counsel the patient. Whereas we used Western blot analysis as our serologic screening assay, the full complement of antibodies present in the profile of these patients suggest to us that recombinant gG2-based assay will also detect such persons. Patients with serologically demonstrated recurrent genital HSV who present with first episode symptoms should be told that they subclinically acquired HSV sometime in their past and that the current reactivation may be unrelated to their current sexual partner.

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References

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