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1 Seroprevalence of HSV-2 in Suburban Primary Care Offices Douglas T. Fleming, MD
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2 Acknowledgements Authors: P. Leone, A. Gilsenan, L. Li, S. Justus Staff from the following organizations: RTI Health Solutions, Quest Diagnostics Clinical Trials, American Social Health Association, and GlaxoSmithKline Investigators, staff and patients from the 36 study sites
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3 Background HSV-2 infection is common: 21.9% of the United States population age >=12 in the early 1990s In the same study, only ~9% of seropositives reported that they had “ever had genital herpes” Fleming D, et al; New England Journal of Medicine, vol. 337, no. 16, October 1997, pp. 1105-11
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4 Background (continued) The great majority of HSV-2 seropositive people experience outbreaks – most unrecognized – with symptoms or viral shedding or both Genital herpes can cause devastating disease in neonates and immunosuppressed people, and appears to facilitate HIV transmission Wald A, et al; N Engl J Med, vol. 342, no. 12, March 2000, pp. 844-50 Fleming D and Wasserheit J; Sexually Transmitted Infections, vol. 75, no. 1, February 1999, pp. 3-17.
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5 Background (continued) Many primary care physicians believe that the HSV-2 seroprevalence rates in national surveys do not apply to their patient populations, and that very few of their patients have genital herpes Anecdotal evidence suggests that this belief is especially strong in more affluent suburban areas
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6 Objectives Provide HSV-2 seroprevalence estimates from a sample of adults attending PCP offices in suburban areas of 6 U.S. communities Describe the demographic and behavioral correlates of genital herpes in this population
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7 Methods Weighted HSV-2 seroprevalence study Target sample size: 5,400 Adults 18 - 59 years of age Not known to be pregnant
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8 Methods 6 U.S. suburban communities
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9 Methods In each of the six metropolitan areas, sampling design began with relatively affluent U.S. Census Tracts, defined as those with above-median values for –Home ownership –Household income –Housing value
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10 Methods Within the group of these census tracts in each metropolitan area, six PCP offices were sampled Between 21 and 76 eligible PCP offices were contacted in each metropolitan area in order to recruit the six participating offices. Little information was available on non- participating offices. Total clinic sample: 36 PCP offices
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11 Methods 150 subjects per PCP office 2 Genders: 75 male / 75 female 4 Age groups: 18 - 29, 30 -39, 40 - 49, 50 – 59 Total: 8 cells (=2 x 4) For weighting purposes, field interviewers counted patients in each cell visiting each office over a 2-week period
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12 Methods Patients were recruited during a normal clinic visit Clinic Staff provided information card to all eligible patients upon check-in, and referred interested subjects to an on-site field interviewer Field interviewers screened subjects, obtained informed consent, and coordinated collection of data
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13 Methods Subjects ….. Provided a blood sample for HSV-2 serology testing, and Filled out a questionnaire
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14 Methods Type-specific HSV-2 serology FOCUS HerpeSelect 2 ELISA IgG kit Processed at central laboratory
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15 Methods All subject-specific results (HSV-2 Ab) undisclosed to PCP, clinic staff, or study sponsor HSV-2 Ab results & counseling services were available to subjects via a toll-free anonymous call to the American Social Health Association
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16 Methods Patients filled out a risk assessment questionnaire using Audio Computer- Assisted Self-Interviewing (ACASI) Included questions on demographics, sexual behaviors, knowledge and beliefs, and symptoms
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17 Methods Results were weighted to the estimated total sample of patients entering physicians’ offices in suburban areas within the selected cities Analyzed in SUDAAN
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18 Study Sample: Gender and Age Total sample: N=5452 Per the study design, sample was distributed nearly equally –among males and females, and –among the four age groupings
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19 Study Sample: Race/Ethnicity Caucasian75.0% African-American14.2% Asian2.8% Hispanic4.3% American Indian0.7% Mixed Race or Other2.9% [Self-reported by respondents: “Please select the one category that most closely applies to you”]
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20 Study Sample: Demographics Married57.3% Employed full- or part-time79.6% Some college, tech/prof.,73.6% or more education > $60,000 in total household income44.9% Private/employer provided insurance81.8%
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21 RESULTS
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22 HSV-2 Seroprevalence Rates Overall25.5% (20.2-30.8) Gender Male22.0% (17.3-26.7) Female28.3% (22.0-34.6) Age group 18-2913.4% (9.3-17.5) 30-3925.2% (18.3-32.1) 40-4931.2% (27.5-34.9) 50-5928.0% (20.2-35.8)
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23 HSV-2 Seroprevalence by Gender and Age Age Group (Year) HSV-2 Seroprevalence (%)
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24 Race / Ethnicity HSV-2 Seroprevalence (%) Seroprevalence Rates by Race/Ethnicity
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25 Seroprevalence Rates by Marital Status Marital Status HSV-2 Seroprevalence (%)
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26 Other Demographic Variables
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27 Seroprevalence Rates by Highest Educational Level Attained Educational Level HSV-2 Seroprevalence (%)
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28 Seroprevalence Rates by Total Household Income in 2001 Household Income HSV-2 Seroprevalence (%)
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29 Seroprevalence Rates by Region Region HSV-2 Seroprevalence (%)
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30 Behavioral Variables
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31 HSV-2 Seroprevalence Rates by Age at First Intercourse Age First Intercourse HSV-2 Seroprevalence (%)
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32 HSV-2 Seroprevalence by Gender and Lifetime No. of Sex Partners* *age-adjusted to US population Lifetime No. Sex Partners HSV-2 Seroprevalence (%)
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33 History of Genital Herpes
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34 History of Genital Herpes “Have you ever been told you have Genital Herpes?” Percent that answered “Yes”: Overall4.3% Males3.4% Females5.1%
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35 History of Genital Herpes Percent of HSV-2-seropositives with a known history of genital herpes: Overall11.9% Males11.6% Females12.1%
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36 Multivariate Analysis: Predictors of HSV-2 Serostatus
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37 Predictors of HSV-2 Serostatus Gender Age Race/Ethnicity Marital Education Income Region Age at First Intercourse Lifetime # Partners X X X X
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38 Limitations Non-random factors may have operated in determining the sample of (1) physician offices, and (2) patients who volunteered Little is known about non-participants (partly because of HIPAA regulations) However…. –There is no a priori reason to suspect bias –Interviewers anecdotally reported high interest rates in all groups.
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39 Limitations (cont’d) HerpesSelect 2 May Have Overestimated Prevalence by 1-2% (Absolute) Versus Gold Standard (Western Blot) Per HerpesSelect 2 package Insert: Sensitivity.=96.1%, Specificity=97%
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40 Conclusions and Recommendations
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41 Conclusions Among patients visiting their primary care physicians in these relatively affluent suburban areas, HSV-2 infection was.. –common (25.5%), but –largely unrecognized (herpes history in 11% of seropositives)
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42 Conclusions Especially strong independent predictors of HSV-2 seroprevalence were –Age –Race/ethnicity –Lifetime number of sexual partners Marked regional differences in HSV-2 seroprevalence were no longer significant after adjustment for other predictors
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43 Recommendations Improve appreciation of the high prevalence of HSV-2 infection, even in populations often considered at “low risk” Improve recognition of genital herpes by clinicians, since –Few seropositives were aware of their infection, despite access to health care –Once a person with GH is able to recognize outbreaks, he or she can take steps that may help avoid infecting partners or neonates
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44 Future Directions Analyses of the dataset are ongoing. Themes to explore include: Predictors of a known history of genital herpes among HSV-2 seropositives Relationship of HSV-2 serostatus to recent history of nonspecific symptoms such as dysuria, genital itch, and discharge.
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45 Q&A
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46 Acknowledgements Authors: D. Fleming, P. Leone, A. Gilsenan, L. Li, S. Justus Staff from the following organizations: RTI Health Solutions, Quest Diagnostics Clinical Trials, American Social Health Association, and GlaxoSmithKline Investigators, staff and patients from the 36 study sites
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47 Backup/Optional slides
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48 NHANES III vs. HS240024 % HSV-2 Seroprevalence OverallCaucasianAfr.-Americans NHANES III Both: 21.917.645.9 Male: 17.814.934.7 Female: 25.620.255.1 HS240024 Both: 25.520.652.4 Male: 22.018.242.6 Female: 28.322.659.4
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49 Subject Disposition Total screened5,732 Ineligible107 Refusal111 Enrolled5,514 Interviewed - no blood specimen37 Problems with blood specimen25 Population for prevalence estimates5,452 Provide blood specimen19 Population for risk modeling5,433
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50 Why Subjects Did Not Participate... Ineligible: out of age range Ineligible: language barrier Ineligible: age/gender cell full Ineligible: pregnant woman Refusal: no reason given Refusal: no time Refusal: not interested Refusal: too sensitive/personal Refusal: due to venipuncture required
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51 Inclusion / Exclusion Criteria Male or female 18 - 59 years of age Able to read and comprehend English in order to complete the Risk Assessment Questionnaire Must be visiting their physician’s office due to illness or injury, annual physical examination, etc.; for any reason except explicitly to enroll Must be willing and able to provide written informed consent and comply with the protocol
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52 Assessments / Procedures Demographic information obtained Completion of Risk Assessment Questionnaire for subsequent analysis of data Field Interviewers: to interact with subjects & office staff to coordinate RAQ & blood sample collection Determination of HSV-2 antibody status via collection of subject blood sample and analysis by central lab (FOCUS HerpeSelect 2 ELISA IgG kit) Educational material regarding genital herpes offered to all subjects
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53 Assessments / Procedures Questionnaire administered in an area conducive to privacy for the patient Duplicate random numbers applied to each subject’s blood sample & questionnaire, thus linking the blood sample to the RAQ Identity of the subject will not be compromised; no subject names on questionnaire or blood sample Conduct of study is not to interfere with patient care One venipuncture if at all possible
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54 Risk Assessment Questionnaire 8 demographic questions 21 questions (symptoms/sexual behavior- attitudes) 14 optional questions (knowledge/beliefs re: STDs) Self-administered via ACASI technology (Audio Computer-Assisted Self-Interviewing)
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55 How to Reach Me Douglas T. Fleming, MD Senior Researcher Mathematica Policy Research, Inc. PO Box 2393 600 Alexander Park Princeton, NJ 08543 Tel. (609) 936-2713 Fax (609) 799-0005 DFleming@Mathematica-MPR.com Our Web site: www.mathematica-mpr.com
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