Last data update: May 13, 2024. (Total: 46773 publications since 2009)
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Query Trace: Samoff E[original query] |
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Measuring Success: Disease Intervention Specialists Performance Metrics and Outcome Assessments
Cope AB , Mobley VL , Samoff E . Sex Transm Dis 2023 50 S18-s22 Disease intervention specialists (DIS) are the cornerstone of public health. However, the incremental gains of DIS-led interventions are difficult to detect at the population level. Health departments attempt to quantify the impact of key DIS activities through performance measures that assess how many and how quickly both patients are interviewed, and contacts are notified, tested, and treated. However, DIS work encompasses more than case finding and existing performance measures may not capture the full value DIS provide to health departments. In this article, we first describe how DIS investigations and contact tracing are conducted for sexually transmitted diseases and other communicable diseases to understand how the definition of effectiveness may vary by disease. Then, we examine the benefits and limitations of traditional performance measures using syphilis investigations as an example. Recognizing the limits of existing measures will improve our understanding of DIS impact and assist in the development of new measures of effectiveness that better represent the totality of DIS work. |
Ten Years of Disseminated Gonococcal Infections in North Carolina: A Review of Cases From a Large Tertiary Care Hospital
Sciaudone M , Cope A , Mobley V , Samoff E , Seña AC . Sex Transm Dis 2023 50 (7) 410-414 BACKGROUND: The detection and reporting of disseminated gonococcal infection (DGI) has been increasing across the United States. METHODS: We conducted a retrospective chart review of DGI case-patients diagnosed between 2010 and 2019 at a large tertiary care hospital in North Carolina. RESULTS: We identified 12 DGI case-patients (7 men and 5 women, aged 20 to 44 years), of whom 5 had Neisseria gonorrheae isolated from a sterile site (confirmed), 2 had N. gonorrheae detected at a nonsterile mucosal site and had clinical manifestations consistent with DGI (probable), and 5 did not have N. gonorrheae isolated from any site, but DGI was the most likely diagnosis (suspect). Among the 12 DGI case-patients, the most common manifestation was arthritis or tenosynovitis (n = 11); 1 patient had endocarditis. Half of the patients had significant underlying comorbidities or predisposing factors, including complement deficiency. Eleven of the 12 case-patients were hospitalized, and 4 required surgical intervention. CONCLUSIONS: This case series highlights the difficulty of making a definitive diagnosis of DGI, which could negatively affect reporting to public health authorities and hinder surveillance efforts to determine the true prevalence of DGI. A high index of suspicion is required, and a full diagnostic workup should be pursued in all cases of suspected DGI. |
Beyond disease intervention: Exploring an expanded role for partner services in the MATRix-NC Demonstration Project
Hurt CB , Morrison AS , Guy J , Mobley VL , Dennis AM , Barrington C , Samoff E , Hightow-Weidman LB , McNeil CJ , Carry MG , Hogben M , Seña AC . Sex Transm Dis 2021 49 (2) 93-98 BACKGROUND: Disease intervention specialists (DIS) provide partner services (PS) for sexually transmitted infections (STI). We assessed an expansion of DIS services for clients with HIV and/or syphilis, and contacts within their social and sexual networks. METHODS: Black and Latinx cisgender men and transgender women who have sex with men diagnosed with HIV and/or syphilis in four urban North Carolina (NC) counties were referred to designated DIS, who were trained to recruit clients as "seeds" for chain-referral sampling of sociosexual network "peers." All received HIV/STI testing and care; referrals for pre-exposure prophylaxis (PrEP) and social, behavioral, and non-STI medical services were offered. Participants completed baseline, 1 month, and 3 month computerized surveys. RESULTS: Of 213 cases referred to DIS from May 2018 to February 2020, 42 seeds (25 with syphilis, 17 with HIV) and 50 peers participated. Median age was 27 years; 93% were Black and 86% were cisgender men. Most peers came from seeds' social networks: 66% were friends, 20% were relatives, and 38% were cisgender women. Incomes were low, 41% were uninsured, and 10% experienced recent homelessness. More seeds than peers had baseline PrEP awareness; attitudes were favorable but utilization was poor. Thirty-seven participants were referred for PrEP 50 times; 17 (46%) accessed PrEP by month 3. Thirty-nine participants received 129 non-PrEP referrals, most commonly for housing assistance, primary care, Medicaid navigation, and food insecurity. CONCLUSIONS: Chain-referral sampling from PS clients allowed DIS to access persons with significant medical and social service needs, demonstrating that DIS can support marginalized communities beyond STI intervention. |
Effectiveness of syphilis partner notification after adjusting for treatment dates, 7 jurisdictions
Cope AB , Bernstein KT , Matthias J , Rahman M , Diesel JC , Pugsley RA , Schillinger JA , Chew Ng RA , Klingler EJ , Mobley VL , Samoff E , Peterman TA . Sex Transm Dis 2021 49 (2) 160-165 INTRODUCTION: Disease intervention specialists (DIS) prevent syphilis by assuring treatment for patients' sex partners through partner notification (PN). Different interpretations of how to measure partners treated due to DIS efforts complicates PN evaluation. We measured PN impact by counting partners treated for syphilis after DIS interviewed the patient. METHODS: We reviewed data from early syphilis cases reported during 2015-2017 in seven jurisdictions. We compared infected partners brought to treatment using: 1) DIS-assigned disposition codes or 2) all infected partners treated 0-90 days after the patient's interview (adjusted treatment estimate). Stratified analyses assessed patient characteristics associated with the adjusted treatment estimate. RESULTS: DIS interviewed 23,613 patients who reported 20,890 partners with locating information. Many of the 3,569 (17.1%) partners classified by DIS as brought to treatment were treated before the patient was interviewed. There were 2,359 (11.3%) partners treated 0-90 days after the patient's interview. Treatment estimates were more consistent between programs when measured using our adjusted estimates (range 6.1%-14.8% per patient interviewed) compared to DIS-assigned disposition (range 6.1%-28.3%). Treatment of >1 partner occurred after 9.0% of interviews and was more likely if the patient was a woman (17.9%), aged <25 years (12.6%), interviewed ≤7 days from diagnosis (13.9%), HIV negative (12.6%), or had no reported history of syphilis (9.8%). CONCLUSIONS: Counting infected partners treated 0-90 days after interview reduced variability in reporting and facilitates quality assurance. Identifying programs and DIS who are particularly good at finding and treating partners could improve program impact. |
Pelvic inflammatory disease trends among emergency department visits in North Carolina, 2008-2017
Neo DT , Samoff E , Cope A . Sex Transm Dis 2021 49 (1) 43-49 BACKGROUND: Pelvic inflammatory disease (PID) is an infection of the upper female reproductive organs that can lead to infertility and ectopic pregnancies. PID is a reportable condition in North Carolina (NC), but is likely underreported. We aimed to quantify PID diagnoses in NC emergency department (ED) visits. METHODS: The NC Disease Event Tracking and Epidemiology Collection Tool (NC DETECT) tracks all ED visits in NC. We identified PID diagnoses among women of reproductive age (15-44 years) between 2008 and 2017 using ICD-9/10-CM codes, and calculated the yearly proportion with PID diagnoses. We assessed the number of PID visits per patient each year, and the proportion of ED visits with a PID diagnosis by age, proportion of the patient's ZIP code living below the poverty line, insurance coverage, and NC provider region. RESULTS: The percent of women with PID decreased from 6,189 (1.0%) in 2008 to 4,337 (0.58%) in 2016 before increasing slightly to 4,371 (0.61%) in 2017. We identified 54,502 (0.45%) ED visits among 51,847 women (0.76%) with ≥1 PID diagnosis code. Most (95.5%) women with PID had one ED visit during the calendar year. Each year, the proportion with PID was highest among women aged 20-24 years, covered under public insurance, from the most impoverished areas, and whose provider was in the Coastal region of NC. CONCLUSION: The percent with PID among women visiting EDs decreased between 2008 and 2017 in NC. Although this decline was observed across all demographics, disparities associated with PID continued to persist over time. |
Intersection of Syphilis and HIV Networks to Identify Opportunities to Enhance HIV Prevention.
Dennis AM , Cressman A , Pasquale D , Frost SDW , Kelly E , Guy J , Mobley V , Samoff E , Hurt CB , McNeil C , Hightow-Weidman L , Carry M , Hogben M , Seña AC . Clin Infect Dis 2021 74 (3) 498-506 BACKGROUND: HIV and syphilis infection continue at disproportionate rates among minority men who have sex with men (MSM) in the United States. The integration of HIV genetic clustering with partner services can provide important insight into local epidemic trends to guide interventions and control efforts. METHODS: We evaluated contact networks of index persons defined as minority men and transgender women diagnosed with early syphilis and/or HIV infection between 2018-2020 in two North Carolina regions. HIV clusters were constructed from pol sequences collected through statewide surveillance. A combined "HIV-risk" network, which included persons with any links (genetic or sexual contact) to HIV-positive persons, was evaluated by component size, demographic factors, and HIV viral suppression. RESULTS: In total, 1,289 index persons were identified and 55% named 1,153 contacts. Most index persons were Black (88%) and young (median age 30 years); 70% had early syphilis and 43% had prevalent HIV infection. Most people with HIV (65%) appeared in an HIV cluster. The combined HIV-risk network (1,590 contact network and 1,500 cluster members) included 287 distinct components; however, 1,586 (51%) were in a single component. Fifty-five percent of network members with HIV had no evidence of viral suppression. Overall, fewer index persons needed to be interviewed to identify one HIV-positive member without viral suppression (1.3 versus 4.0 for contact tracing). CONCLUSIONS: Integration of HIV clusters and viral loads illuminate networks with high HIV prevalence, indicating recent and ongoing transmission. Interventions intensified towards these networks may efficiently reach persons for HIV prevention and care re-engagement. |
Applying a machine learning modelling framework to predict delayed linkage to care in patients newly diagnosed with HIV in Mecklenburg County, North Carolina, USA.
Chen S , Owolabi Y , Dulin M , Robinson P , Witt B , Samoff E . AIDS 2021 35 S29-s38 BACKGROUND: Machine learning has the potential to help researchers better understand and close the gap in HIV care delivery in large metropolitan regions such as Mecklenburg County, North Carolina, USA. OBJECTIVES: We aim to identify important risk factors associated with delayed linkage to care for HIV patients with novel machine learning models and identify high-risk regions of the delay. METHODS: Deidentified 2013-2017 Mecklenburg County surveillance data in eHARS format were requested. Both univariate analyses and machine learning random forest model (developed in R 3.5.0) were applied to quantify associations between delayed linkage to care (>30 days after diagnosis) and various risk factors for individual HIV patients. We also aggregated linkage to care by zip codes to identify high-risk communities within the county. RESULTS: Types of HIV-diagnosing facility significantly influenced time to linkage; first diagnosis in hospital was associated with the shortest time to linkage. HIV patients with lower CD4+ cell counts (<200/ml) were twice as likely to link to care within 30 days than those with higher CD4+ cell count. Random forest model achieved high accuracy (>80% without CD4+ cell count data and >95% with CD4+ cell count data) to predict risk of delay in linkage to care. In addition, we also identified top high-risk zip codes of delayed linkage. CONCLUSION: The findings helped public health teams identify high-risk communities of delayed HIV care continuum across Mecklenburg County. The methodology framework can be applied to other regions with HIV epidemic and challenge of delayed linkage to care. |
Unnamed partners from syphilis partner services interviews, 7 jurisdictions
Cope AB , Bernstein K , Matthias J , Rahman M , Diesel J , Pugsley RA , Schillinger JA , Chew Ng RA , Sachdev D , Shaw R , Nguyen TQ , Klingler EJ , Mobley VL , Samoff E , Peterman TA . Sex Transm Dis 2020 47 (12) 811-818 BACKGROUND: Reducing transmission depends on the percentage of infected partners treated; if many are missed, impact on transmission will be low. Traditional partner services metrics evaluate the number of partners found and treated. We estimated the proportion of partners of syphilis patients not locatable for intervention. METHODS: We reviewed records of early syphilis cases (primary, secondary, early latent) reported during 2015-2017 in seven jurisdictions (Florida, Louisiana, Michigan, North Carolina, Virginia, New York City, and San Francisco). Among interviewed syphilis patients, we determined the proportion who reported named partners (with locating information), reported unnamed partners (no locating information), and did not report partners. For patients with no reported partners, we estimated their range of unreported partners to be between one and the average number of partners for patients who reported partners. RESULTS: Among 29,719 syphilis patients, 23,613 (80%) were interviewed and 18,581 (63%) reported 84,224 sex partners (average=4.5; 20,853 (25%) named and 63,371 (75%) unnamed). An estimated 11,138 to 54,521 partners were unreported. Thus, 74,509 to 117,892 (of 95,362 to 138,745) partners were not reached by partner services (78-85%). Among interviewed patients, 71% reported ≥1 unnamed partner or reported no partners; this proportion was higher for men who reported sex with men [MSM] (75%), compared to men who reported sex with women only (65%), and women (44%). CONCLUSION: Approximately 80% of sex partners were either unnamed or unreported. Partner services may be less successful at interrupting transmission in MSM networks where a higher proportion of partners are unnamed or unreported. |
HIV outbreak control with effective access to care and harm reduction in North Carolina, 2017-2018
Samoff E , Mobley V , Hudgins M , Cope AB , Adams ND , Caputo CR , Dennis AM , Billock RM , Crowley CA , Clymore JM , Foust E . Am J Public Health 2020 110 (3) e1-e7 Objectives. To assess and control a potential outbreak of HIV among people who inject drugs in Western North Carolina.Methods. Disease intervention specialists offered testing for hepatitis B and hepatitis C, harm reduction materials, and linkage to care to 7 linked people recently diagnosed with HIV who also injected drugs. Contacts were offered the same services and HIV testing. HIV genotype analysis was used to characterize HIV spread. We assessed testing and care outcomes by using state surveillance information.Results. Disease intervention specialists contacted 6 of 7 linked group members and received information on 177 contacts; among 96 prioritized contacts, 42 of 96 (44%) were exposed to or diagnosed with hepatitis C, 4 of 96 (4%) had hepatitis B, and 14 of 96 (15%) had HIV (2 newly diagnosed during the investigation). HIV genotype analysis suggested recent transmission to linked group members and 1 contact. Eleven of 14 with HIV were virally suppressed following the outbreak response.Conclusions. North Carolina identified and rapidly responded to an HIV outbreak among people reporting injecting drugs. Effective HIV care, the availability of syringe exchange services, and the rapid response likely contributed to controlling this outbreak. (Am J Public Health. Published online ahead of print January 16, 2020: e1-e7. doi:10.2105/AJPH.2019.305490). |
The changing role of disease intervention specialists in modern public health programs
Cope AB , Mobley VL , Samoff E , O'Connor K , Peterman TA . Public Health Rep 2018 134 (1) 33354918813549 For decades, disease intervention specialists have worked on the front lines of public health, defending against the spread of sexually transmitted diseases (STDs), including HIV. The transmission of STDs can be interrupted when a disease intervention specialist contacts recently diagnosed persons, ensures that they are treated, identifies their sexual partners, and ensures that the partners are tested and treated. The success of this work depends on the ability and willingness of patients to name their sexual partners; the ability of the disease intervention specialist to promptly interview infected persons, find their sexual partners by using available resources, and maintain patient confidentiality; and the cooperation of local providers and community stakeholders in coordinating prevention messaging. With proper training and resources, disease intervention specialists provide an effective, albeit costly, service for health departments to control the spread of STDs and HIV.1 |
Ocular syphilis and HIV coinfection among syphilis patients in North Carolina, 2014-2016
Cope AB , Mobley VL , Oliver SE , Larson M , Dzialowy N , Maxwell J , Rinsky JL , Peterman TA , Fleischauer A , Samoff E . Sex Transm Dis 2018 46 (2) 80-85 BACKGROUND: Ocular syphilis (OS) has been associated with HIV coinfection previously. We compared demographic and clinical characteristics of syphilis patients with and without HIV to identify risk factors for developing OS. METHODS: We reviewed all syphilis cases (early and late) reported to the North Carolina (NC) Division of Public Health during 2014-2016 and categorized HIV status (positive, negative, unknown) and OS status based on report of ocular symptoms with no other defined etiology. We estimated prevalence ratios (PR) and 95% confidence intervals (CI) for OS by HIV status. Among syphilis patients with HIV, we compared viral loads and CD4 cell counts by OS status. We compared symptom resolution by HIV status for a subset of OS patients. RESULTS: Among 7,123 confirmed syphilis cases, 2,846 (39.9%) were living with HIV, 109 (1.5%) had OS, and 59 (0.8%) had both. OS was more prevalent in syphilis patients with HIV compared to HIV-negative/unknown-status patients (PR: 1.8; 95% CI: 1.2, 2.6). Compared to other patients with HIV, the prevalence of OS was higher in patients with viral loads >200 copies/mL (1.7; 1.0, 2.8) and in patients with a CD4 count </=200 cells/mL (2.3; 1.3, 4.2). Among 11 patients with severe OS, 9 (81.8%) were HIV-positive. Among 39 interviewed OS patients, OS symptom resolution was similar for HIV-positive (70.0%) and HIV-negative/unknown-status (68.4%) patients. CONCLUSION: Syphilis patients with HIV were nearly twice as likely to report OS symptoms as were patients without documented HIV. HIV-related immunodeficiency possibly increases the risk of OS development in co-infected patients. |
A Comparison of syphilis partner notification outcomes by reported use of internet-based apps to meet sex partners in North Carolina, 2013-2016
Mobley V , Cope A , Dzialowy N , Maxwell J , Foust E , Samoff E . Sex Transm Dis 2018 45 (12) 823-828 BACKGROUND: Partner notification services (PNS) remain the backbone of syphilis control. The popularity of internet-based apps to meet sex partners among early syphilis (ES) patients may hinder the success of PNS if partners cannot be located. METHODS: We compared demographic and clinical characteristics between male ES patients indicating sex with men (MSM) and reported in North Carolina between 2013 and 2016 by reported use of an internet-based app to meet sex partners (app user). We used multivariable log-binomial regression to assess the association between app usage and ES exposure notification of >/=1 sex partner. RESULTS: Among 3,414 MSM ES patients, 58.6% were app users. App users were more frequently white (33.2% vs. 27.3%; p=0.003), younger (median: 28 vs. 30 years; p=0.0002) and less frequently HIV co-infected (54.1% vs. 58.2%; p=0.02) compared to non-app users. Overall, 94.9% of app users and 89.6% of non-app users reported >/=1 sex partner. App users reported 2.5-times more locatable and 2.7-times more unlocatable sex partners than non-app users. Similar proportions of app (23.6%) and non-app users (25.0%) reported only unlocatable partners (p=0.4). App usage was not associated with ES exposure notification of >/=1 sex partner (adjusted risk ratio: 0.99; 95% confidence interval: 0.87-1.13). CONCLUSION: We observed no difference in the proportion of locatable partners or likelihood of notifying >/=1 sex partner of exposure among MSM ES patients, by reported use of internet-based apps to meet sex partners. PNS continues to be an important mechanism to locate and assure treatment for sex partners in this population. |
Increases in ocular syphilis - North Carolina, 2014-2015
Oliver SE , Cope AB , Rinsky JL , Williams C , Liu G , Hawks S , Peterman TA , Markowitz L , Fleischauer AT , Samoff E . Clin Infect Dis 2017 65 (10) 1676-1682 Background: Ocular syphilis is an inflammatory eye disease due to Treponema pallidum infection. In the United States, syphilis rates have increased since 2000; clusters of ocular syphilis were reported in 2015. We investigated ocular syphilis in North Carolina to describe the epidemiology and clinical course of disease. Methods: We reviewed syphilis cases reported to North Carolina during 2014-2015 and abstracted information from health department interviews for cases with ocular symptoms and no other defined etiology. To assess duration and severity of ocular symptoms, we also reviewed medical records and conducted structured interviews. We compared the prevalence of ocular manifestations among reported syphilis cases by demographic and clinical characteristics. Results: Among 4232 syphilis patients, 63 (1.5%) had ocular syphilis: 21 in 2014 and 42 in 2015, a 100% increase. Total syphilis cases increased 35% through 2015. No patient with ocular syphilis named another ocular syphilis patient as a sex partner. Patients presented in all syphilis stages; 24 (38%) were diagnosed in primary or secondary syphilis. Ocular manifestations were more prevalent among syphilis patients who were male, aged ≥40 years, white, and infected with human immunodeficiency virus. No risk behaviors were associated with ocular syphilis. Among 39 interviewed patients, 34 (87%) reported reduced vision during infection; 12 (31%) reported residual visual symptoms posttreatment. Conclusions: In North Carolina, ocular syphilis increased from 2014 to 2015 and may be due to increased recognition of ocular manifestations, or a true increase in ocular syphilis. Many ocular syphilis patients experienced vision loss; however, most improved posttreatment. |
The Number of Interviews Needed to Yield New Syphilis and Human Immunodeficiency Virus Cases Among Partners of People Diagnosed With Syphilis, North Carolina, 2015
Samoff E , Cope AB , Maxwell J , Thomas F , Mobley VL . Sex Transm Dis 2017 44 (8) 451-456 Compare syphilis investigation yield among patient groups using number needed to interview. GOAL: To increase investigation efficiency. STUDY DESIGN: Retrospective review of North Carolina 2015 syphilis investigations, using the number of cases needed to interview (NNTI) and the total number of cases and contacts needed to interview (TNTI) to compare yield of new syphilis and human immunodeficiency virus diagnoses between patient groups. RESULTS: We reviewed 1646 early syphilis cases and 2181 contacts; these yielded 241 new syphilis cases (NNTI, 6.9; TNTI, 16.4) and 38 new human immunodeficiency virus cases (NNTI, 43). Interviews of women (prevalence difference [PD] = 6%, 95% confidence interval [CI], 12-16), patients <30 years old (PD = 5%, 95% CI, 1-8), and patients with titer >1:16 (PD = 5%, 95% CI, 1-9) yielded more new syphilis cases in our adjusted model; no other patient factors increased investigation yield. CONCLUSIONS: The NNTI and TNTI are useful measures of efficiency. Prioritizing early syphilis investigation by gender, rapid plasmin reagin titer, and age provides small increases in efficiency; no other factors increased efficiency. |
We can have it all: improved surveillance outcomes and decreased personnel costs associated with electronic reportable disease surveillance, North Carolina, 2010
Samoff E , Dibiase L , Fangman MT , Fleischauer AT , Waller AE , MacDonald PD . Am J Public Health 2013 103 (12) 2292-7 OBJECTIVES: We assessed the timeliness, accuracy, and cost of a new electronic disease surveillance system at the local health department level. We describe practices associated with lower cost and better surveillance timeliness and accuracy. METHODS: Interviews conducted May through August 2010 with local health department (LHD) staff at a simple random sample of 30 of 100 North Carolina counties provided information on surveillance practices and costs; we used surveillance system data to calculate timeliness and accuracy. We identified LHDs with best timeliness and accuracy and used these categories to compare surveillance practices and costs. RESULTS: Local health departments in the top tertiles for surveillance timeliness and accuracy had a lower cost per case reported than LHDs with lower timeliness and accuracy ($71 and $124 per case reported, respectively; P = .03). Best surveillance practices fell into 2 domains: efficient use of the electronic surveillance system and use of surveillance data for local evaluation and program management. CONCLUSIONS: Timely and accurate surveillance can be achieved in the setting of restricted funding experienced by many LHDs. Adopting best surveillance practices may improve both efficiency and public health outcomes. |
Integration of syndromic surveillance data into public health practice at state and local levels in North Carolina
Samoff E , Waller A , Fleischauer A , Ising A , Davis MK , Park M , Haas SW , Dibiase L , MacDonald PDM . Public Health Rep 2012 127 (3) 310-317 OBJECTIVES: We sought to describe the integration of syndromic surveillance data into daily surveillance practice at local health departments (LHDs) and make recommendations for the effective integration of syndromic and reportable disease data for public health use. METHODS: Structured interviews were conducted with local health directors and communicable disease nursing staff from a stratified random sample of LHDs from May through September 2009. Interviews captured information on direct access to the North Carolina syndromic surveillance system and on the use of syndromic surveillance information for outbreak management, program management, and the creation of reports. We analyzed syndromic surveillance system data to assess the number of signals resulting in a public health response. RESULTS: Syndromic surveillance data were used for outbreak investigation (19% of respondents) and program management and report writing (43% of respondents); a minority reported use of both syndromic and reportable disease data for these purposes (15% and 23%, respectively). Receiving data from frequent system users was associated with using data for these purposes (p50.016 and p50.033, respectively, for syndromic and reportable disease data). A small proportion of signals (<25%) resulted in a public health response. CONCLUSIONS: Use of syndromic surveillance data by North Carolina local public health authorities resulted in meaningful public health action, including both case investigation and program management. While useful, the syndromic surveillance data system was oriented toward sensitivity rather than efficiency. Successful incorporation of new surveillance data is likely to require systems that are oriented toward efficiency. (2012 Association of Schools of Public Health.) |
Pre-treatment syphilis titers: distribution and evaluation of their use to distinguish early from late latent syphilis and to prioritize contact investigations
Samoff E , Koumans EH , Gibson JJ , Ross M , Markowitz LE . Sex Transm Dis 2009 36 (12) 789-93 BACKGROUND: Treatment, contact investigation, and reporting decisions for syphilis cases are based on the stage of disease. Because of limitations of current staging protocols, the rapid plasma reagin (RPR) titer has been proposed as an alternative priority marker for contact investigation. METHODS: We describe the RPR titers and stages for 10,021 syphilis cases reported between 1997 and 1999 in Columbia, South Carolina; Houston, Texas; and Jackson, Mississippi. We constructed receiver operating characteristic curves (ROC curves) to compare titer and stage. We calculated the number of infected contacts to evaluate the use of titer to prioritize contact investigation. RESULTS: RPR titers differed by stage, with 67% of primary, 95% of secondary, 78% of early latent, and 41% of late latent and unknown duration having titers >1:8; however, there was considerable overlap in titer distributions. The ROC curve based on titer values demonstrated good agreement between titer and latent stage. Prioritization by titer (≥1:8) of latent cases would result in a similar number of cases interviewed and contacts located as stage prioritization, although different cases are prioritized. CONCLUSION: Titer distributions meaningfully but imperfectly distinguish populations with different stages. Recent analyses and anecdotal reports indicate the difficulty and inconsistency of staging latent syphilis. Over time, titer could provide a more objective and reliable historical record of syphilis trends. Titer may be a useful alternative or adjunct to stage in prioritizing latent syphilis cases for investigation. |
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