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Flaig J, Hocqueloux L, Palich R, Cuzin L, Robineau O, Pugliese P, Delpierre C, Voirin N, Cotte L. Epidemiological impact of Neisseria gonorrhoeae and Chlamydia trachomatis screening in men having sex with men: a modelling study. Sex Transm Infect 2024; 100:349-355. [PMID: 38789265 DOI: 10.1136/sextrans-2023-056103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Accepted: 05/14/2024] [Indexed: 05/26/2024] Open
Abstract
OBJECTIVES The impact of the systematic screening of Neisseria gonorrhoeae (NG) and Chlamydia trachomatis (CT) in men having sex with men (MSM) on these pathogens' epidemiology remains unclear. We conducted a modelling study to analyse this impact in French MSM. METHODS We modelled NG and CT transmission using a site-specific deterministic compartmental model. We calibrated NG and CT prevalence at baseline using results from MSM enrolled in the Dat'AIDS cohort. The baseline scenario was based on 1 million MSM, 40 000 of whom were tested every 90 days and 960 000 every 200 days. Incidence rate ratios (IRRs) at steady state were simulated for NG, CT, NG and/or CT infections, for different combinations of tested sites, testing frequency and numbers of frequently tested patients. RESULTS The observed prevalence rate was 11.0%, 10.5% and 19.1% for NG, CT and NG and/or CT infections. The baseline incidence rate was estimated at 138.2 per year per 100 individuals (/100PY), 86.8/100PY and 225.0/100PY for NG, CT and NG and/or CT infections. Systematically testing anal, pharyngeal and urethral sites at the same time reduced incidence by 14%, 23% and 18% (IRR: 0.86, 0.77 and 0.82) for NG, CT and NG and/or CT infections. Reducing the screening interval to 60 days in frequently tested patients reduced incidence by 20%, 29% and 24% (IRR: 0.80, 0.71 and 0.76) for NG, CT and NG and/or CT infections. Increasing the number of frequently tested patients to 200 000 reduced incidence by 29%, 40% and 33% (IRR: 0.71, 0.60 and 0.67) for NG, CT and NG and/or CT infections. No realistic scenario could decrease pathogens' incidence by more than 50%. CONCLUSIONS To curb the epidemic of NG and CT in MSM, it would not only be necessary to drastically increase screening, but also to add other combined interventions.
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Affiliation(s)
| | | | - Romain Palich
- Department of Infectious Diseases, Sorbonne Université, INSERM, Institut Pierre Louis d'Epidémiologie et de Santé Publique (iPLESP), AP-HP, Pitié Salpêtrière Hospital, Paris, France
| | - Lise Cuzin
- CHU de Martinique, Fort-de-France, Martinique
| | | | | | | | | | - Laurent Cotte
- Infectious Diseases, Hopital de la Croix-Rousse, Lyon, France
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Clay PA, Pollock ED, Copen CE, Anyalechi EG, Danavall DC, Hong J, Khosropour CM, Galloway E, Spicknall IH. Using infection prevalence, seroprevalence and case report data to estimate chlamydial infection incidence. Sex Transm Infect 2023; 99:513-519. [PMID: 37648446 PMCID: PMC11323310 DOI: 10.1136/sextrans-2023-055808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Accepted: 08/12/2023] [Indexed: 09/01/2023] Open
Abstract
OBJECTIVES To measure the effectiveness of chlamydia control strategies, we must estimate infection incidence over time. Available data, including survey-based infection prevalence and case reports, have limitations as proxies for infection incidence. We therefore developed a novel method for estimating chlamydial incidence. METHODS We linked a susceptible infectious mathematical model to serodynamics data from the National Health and Nutritional Examination Survey, as well as to annual case reports. We created four iterations of this model, varying assumptions about how the method of infection clearance (via treatment seeking, routine screening or natural clearance) relates to long-term seropositivity. Using these models, we estimated annual infection incidence for women aged 18-24 and 25-37 years in 2014. To assess model plausibility, we also estimated natural clearance for the same groups. RESULTS Of the four models we analysed, the model that best explained the empirical data was the one in which longer-lasting infections, natural clearance and symptomatic infections all increased the probability of long-term seroconversion. Using this model, we estimated 5910 (quartile (Q)1, 5330; Q3, 6500) incident infections per 100 000 women aged 18-24 years and 2790 (Q1, 2500; Q3, 3090) incident infections per 100 000 women aged 25-37 years in 2014. Furthermore, we estimated that natural clearance rates increased with age. CONCLUSIONS Our method can be used to estimate the number of chlamydia infections each year, and thus whether infection incidence increases or decreases over time and after policy changes. Furthermore, our results suggest that clearance via medical intervention may lead to short-term or no seroconversion, and the duration of untreated chlamydial infection may vary with age, underlining the complexity of chlamydial infection dynamics.
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Affiliation(s)
- Patrick A Clay
- Division of STD Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Emily D Pollock
- Division of STD Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Casey E Copen
- Division of STD Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - E Gloria Anyalechi
- Division of Healthcare Quality Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Damien C Danavall
- Division of STD Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Jaeyoung Hong
- Division of STD Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | | | - Eboni Galloway
- Division of STD Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Ian H Spicknall
- Division of STD Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
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3
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Lohan M, Gillespie K, Aventin Á, Gough A, Warren E, Lewis R, Buckley K, McShane T, Brennan-Wilson A, Lagdon S, Adara L, McDaid L, French R, Young H, McDowell C, Logan D, Toase S, Hunter RM, Gabrio A, Clarke M, O'Hare L, Bonell C, Bailey JV, White J. School-based relationship and sexuality education intervention engaging adolescent boys for the reductions of teenage pregnancy: the JACK cluster RCT. PUBLIC HEALTH RESEARCH 2023; 11:1-139. [PMID: 37795864 DOI: 10.3310/ywxq8757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/06/2023] Open
Abstract
Background The need to engage boys in gender-transformative relationships and sexuality education (RSE) to reduce adolescent pregnancy is endorsed by the World Health Organization and the United Nations Educational, Scientific and Cultural Organization. Objectives To evaluate the effects of If I Were Jack on the avoidance of unprotected sex and other sexual health outcomes. Design A cluster randomised trial, incorporating health economics and process evaluations. Setting Sixty-six schools across the four nations of the UK. Participants Students aged 13-14 years. Intervention A school-based, teacher-delivered, gender-transformative RSE intervention (If I Were Jack) versus standard RSE. Main outcome measures Self-reported avoidance of unprotected sex (sexual abstinence or reliable contraceptive use at last sex) after 12-14 months. Secondary outcomes included knowledge, attitudes, skills, intentions and sexual behaviours. Results The analysis population comprised 6556 students: 86.6% of students in the intervention group avoided unprotected sex, compared with 86.4% in the control group {adjusted odds ratio 0.85 [95% confidence interval (CI) 0.58 to 1.26], p = 0.42}. An exploratory post hoc analysis showed no difference for sexual abstinence [78.30% intervention group vs. 78.25% control group; adjusted odds ratio 0.85 (95% CI 0.58 to 1.24), p = 0.39], but more intervention group students than control group students used reliable contraception at last sex [39.62% vs. 26.36%; adjusted odds ratio 0.52 (95% CI 0.29 to 0.920), p = 0.025]. Students in schools allocated to receive the intervention had significantly higher scores on knowledge [adjusted mean difference 0.18 (95% CI 0.024 to 0.34), p = 0.02], gender-equitable attitudes and intentions to avoid unintended pregnancy [adjusted mean difference 0.61 (95% CI 0.16 to 1.07), p = 0.01] than students in schools allocated to receive the control. There were positive but non-significant differences in sexual self-efficacy and communication skills. The total mean incremental cost of the intervention compared with standard RSE was £2.83 (95% CI -£2.64 to £8.29) per student. Over a 20-year time horizon, the intervention is likely to be cost-effective owing to its impact on unprotected sex because it would result in 379 (95% CI 231 to 477) fewer unintended pregnancies, 680 (95% CI 189 to 1467) fewer sexually transmitted infections and a gain of 10 (95% CI 5 to 16) quality-adjusted life-years per 100,000 students for a cost saving of £9.89 (95% CI -£15.60 to -£3.83). Limitations The trial is underpowered to detect some effects because four schools withdrew and the intraclass correlation coefficient (0.12) was larger than that in sample size calculation (0.01). Conclusions We present, to our knowledge, the first evidence from a randomised trial that a school-based, male engagement gender-transformative RSE intervention, although not effective in increasing avoidance of unprotected sex (defined as sexual abstinence or use of reliable contraception at last sex) among all students, did increase the use of reliable contraception at last sex among students who were, or became, sexually active by 12-14 months after the intervention. The trial demonstrated that engaging all adolescents early through RSE is important so that, as they become sexually active, rates of unprotected sex are reduced, and that doing so is likely to be cost-effective. Future work Future studies should consider the longer-term effects of gender-transformative RSE as students become sexually active. Gender-transformative RSE could be adapted to address broader sexual health and other settings. Trial registration This trial is registered as ISRCTN10751359. Funding This project was funded by the National Institute for Health and Care Research (NIHR) Public Health Research programme (PHR 15/181/01) and will be published in full in Public Health Research; Vol. 11, No. 8. See the NIHR Journals Library website for further project information.
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Affiliation(s)
- Maria Lohan
- School of Nursing and Midwifery, Queen's University Belfast, Belfast, UK
| | - Kathryn Gillespie
- School of Nursing and Midwifery, Queen's University Belfast, Belfast, UK
| | - Áine Aventin
- School of Nursing and Midwifery, Queen's University Belfast, Belfast, UK
| | - Aisling Gough
- School of Nursing and Midwifery, Queen's University Belfast, Belfast, UK
| | - Emily Warren
- Department of Public Health, Environments and Society, London School of Hygiene & Tropical Medicine, London, UK
| | - Ruth Lewis
- Medical Research Council/Chief Scientist Office Social and Public Health Sciences Unit, University of Glasgow, Glasgow, UK
| | - Kelly Buckley
- Centre for Development, Evaluation, Complexity and Implementation in Public Health Improvement, Cardiff University, Cardiff, UK
| | - Theresa McShane
- School of Nursing and Midwifery, Queen's University Belfast, Belfast, UK
| | | | - Susan Lagdon
- School of Nursing and Midwifery, Queen's University Belfast, Belfast, UK
| | - Linda Adara
- Centre for Development, Evaluation, Complexity and Implementation in Public Health Improvement, Cardiff University, Cardiff, UK
| | - Lisa McDaid
- Medical Research Council/Chief Scientist Office Social and Public Health Sciences Unit, University of Glasgow, Glasgow, UK
| | - Rebecca French
- Department of Public Health, Environments and Society, London School of Hygiene & Tropical Medicine, London, UK
| | - Honor Young
- Centre for Development, Evaluation, Complexity and Implementation in Public Health Improvement, Cardiff University, Cardiff, UK
| | | | | | - Sorcha Toase
- Northern Ireland Clinical Trials Unit, Belfast, UK
| | - Rachael M Hunter
- Health Economics Analysis and Research Methods Team, University College London, London, UK
| | - Andrea Gabrio
- Care and Public Health Research Institute (CAPHRI) School for Public Health and Primary Care, Maastricht University, Maastricht, the Netherlands
| | - Mike Clarke
- Northern Ireland Clinical Trials Unit, Belfast, UK
| | - Liam O'Hare
- School of Social Sciences, Education and Social Work, Queen's University Belfast, Belfast, UK
| | - Chris Bonell
- Department of Public Health, Environments and Society, London School of Hygiene & Tropical Medicine, London, UK
| | | | - James White
- Centre for Development, Evaluation, Complexity and Implementation in Public Health Improvement, Cardiff University, Cardiff, UK
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Khosropour CM, Coomes DM, Barbee LA. Frequency and Combination of Sequential Sexual Acts That May Lead to Sexually Transmitted Infections at Different Anatomic Sites Within the Same Person. ARCHIVES OF SEXUAL BEHAVIOR 2023; 52:823-831. [PMID: 36459349 PMCID: PMC9717570 DOI: 10.1007/s10508-022-02486-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 10/19/2022] [Accepted: 11/16/2022] [Indexed: 06/17/2023]
Abstract
Modeling studies suggest that transmission of gonorrhea and chlamydia to multiple anatomic sites within the same person is necessary to reproduce observed high rates of extragenital gonorrhea/chlamydia. Limited empiric behavioral data support this idea. In this cross-sectional study, we enrolled individuals assigned male at birth who reported sex with men (MSM) and denied receptive anal sex (RAS) in the past 2 years. Participants enrolled in-person at the Sexual Health Clinic in Seattle, Washington (December 2019-September 2021) or online (July 2021-September 2021), and completed a sexual history questionnaire that asked about specific sexual acts and sequence of those acts during their last sexual encounter. We enrolled 210 MSM during the 16-month recruiting period. The median number of sex acts reported at last sexual encounter was 4 (interquartile range 3-5). The most commonly reported acts at last sex were: kissing (83%), receiving oral sex (82%), and insertive anal sex (65%). There was substantial variability in the sequence of acts reported; no unique sequence of sex acts was reported by more than 12% of the population. Ninety percent of participants reported sequences of behaviors that could lead to gonorrhea or chlamydia transmission within the same person (respondent or partner); the most common of these combinations was kissing followed by receiving oral sex (64% reporting). Engaging in multiple sex acts within a single sexual encounter is common and may lead to gonorrhea/chlamydia transmission within the same person. This complicates empiric measurements of transmission probabilities needed to estimate population-level transmission.
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Affiliation(s)
- Christine M Khosropour
- Department of Epidemiology, University of Washington, 325 Ninth Avenue, Box 359777, Seattle, WA, 98104, USA.
| | - David M Coomes
- Department of Epidemiology, University of Washington, 325 Ninth Avenue, Box 359777, Seattle, WA, 98104, USA
| | - Lindley A Barbee
- Department of Medicine, University of Washington, Seattle, WA, USA
- HIV/STD Program, Public Health - Seattle & King County, Seattle, WA, USA
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Weng R, Zhang C, Wen L, Luo Y, Ye J, Wang H, Li J, Ning N, Huang J, Chen X, Cai Y. Chlamydia-related knowledge, opinion to opportunistic testing, and practices of providers among different sexually transmitted infections related departments in hospitals in Shenzhen city, China. BMC Health Serv Res 2022; 22:601. [PMID: 35509056 PMCID: PMC9067339 DOI: 10.1186/s12913-022-08012-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Accepted: 04/27/2022] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Chlamydia trachomatis (CT) infection could lead to seriously adverse outcomes if left untreated. This study aimed to determine CT-related knowledge, opinion to testing, and practices of providers among different sexually transmitted infections (STI) related departments in hospitals in Shenzhen city, China, and also to explore the differences in these responses. MATERIALS AND METHODS From 1st April 2018 to 15th April 2018, a cross-sectional study was conducted in Shenzhen and 64 of 66 hospitals agreed to participate in this study. In the hospital sites, all the providers from the department of obstetrics and gynecology, department of dermatology and venereology, department of urology, and anorectal surgical department were recruited. A structured paper-based questionnaire was used to obtain data on CT-related information. RESULTS A total of 355 providers from 64 hospitals participated in the current study. Compared to providers from the department of dermatology and venereology, those from the department of obstetrics and gynecology (OR = 0.31, 95% CI 0.16-0.62), department of urology (OR = 0.32, 95% CI 0.16-0.65), and anorectal surgical department (OR = 0.25, 95% CI 0.09-0.71) were less likely to identify that "Be in a long-term mutually monogamous relationship with a partner who has been tested and has negative STI test results." is an appropriate way for a sexually active person to reduce risk of getting CT. Also, those from the department of obstetrics and gynecology (OR = 0.45, 95% CI 0.23-0.87) were less likely to identify that "Use latex condoms the right way every time you have sex" is another appropriate way. A high proportion of providers agreed that all sexually active patients attending to their department should be screened regularly (77.1%), and they are willing to offer opportunistic CT screening (96.0%). Only 11.4% of respondents correctly identified that the appropriate time frame of the CT retesting is three months. CONCLUSIONS Providers among STI-related departments in hospitals showed a very high willingness to offer opportunistic CT screening. However, this study showed important gaps in providers' knowledge and practices in China, targeted training in CT-related knowledge and practice is urgently needed.
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Affiliation(s)
- Rongxing Weng
- Department of STD Control and Prevention, Shenzhen Center for Chronic Disease Control, No. 2021, Buxin Road, Luohu District, Shenzhen City, Guangdong Province, China
| | - Chunlai Zhang
- Department of STD Control and Prevention, Shenzhen Center for Chronic Disease Control, No. 2021, Buxin Road, Luohu District, Shenzhen City, Guangdong Province, China
| | - Lizhang Wen
- Department of STD Control and Prevention, Shenzhen Center for Chronic Disease Control, No. 2021, Buxin Road, Luohu District, Shenzhen City, Guangdong Province, China
| | - Yiting Luo
- Department of STD Control and Prevention, Shenzhen Center for Chronic Disease Control, No. 2021, Buxin Road, Luohu District, Shenzhen City, Guangdong Province, China
| | - Jianbin Ye
- Department of STD Control and Prevention, Shenzhen Center for Chronic Disease Control, No. 2021, Buxin Road, Luohu District, Shenzhen City, Guangdong Province, China
| | - Honglin Wang
- Department of STD Control and Prevention, Shenzhen Center for Chronic Disease Control, No. 2021, Buxin Road, Luohu District, Shenzhen City, Guangdong Province, China
| | - Jing Li
- Department of STD Control and Prevention, Shenzhen Center for Chronic Disease Control, No. 2021, Buxin Road, Luohu District, Shenzhen City, Guangdong Province, China
| | - Ning Ning
- Department of STD Control and Prevention, Shenzhen Center for Chronic Disease Control, No. 2021, Buxin Road, Luohu District, Shenzhen City, Guangdong Province, China
- Shantou University Medical College, Shantou, 515000, China
| | - Junxin Huang
- Department of STD Control and Prevention, Shenzhen Center for Chronic Disease Control, No. 2021, Buxin Road, Luohu District, Shenzhen City, Guangdong Province, China
| | - Xiangsheng Chen
- Chinese Academy of Medical Sciences & Peking Union Medical College Institute of Dermatology, Nanjing, China
- National Center for STD Control, China Center for Disease Control and Prevention, Nanjing, China
| | - Yumao Cai
- Department of STD Control and Prevention, Shenzhen Center for Chronic Disease Control, No. 2021, Buxin Road, Luohu District, Shenzhen City, Guangdong Province, China.
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Dukers-Muijrers NHTM, Evers YJ, Hoebe CJPA, Wolffs PFG, de Vries HJC, Hoenderboom B, van der Sande MAB, Heijne J, Klausner JD, Hocking JS, van Bergen J. Controversies and evidence on Chlamydia testing and treatment in asymptomatic women and men who have sex with men: a narrative review. BMC Infect Dis 2022; 22:255. [PMID: 35287617 PMCID: PMC8922931 DOI: 10.1186/s12879-022-07171-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2021] [Accepted: 02/03/2022] [Indexed: 11/19/2022] Open
Abstract
Background Chlamydia trachomatis (CT) is the most common bacterial sexually transmitted infection (STI) worldwide. CT is mainly asymptomatic. Test-and-treat strategies are widely implemented to prevent transmission and complications. Strategies are not without controversy in asymptomatic women and men who have sex with men (MSM). Concerns are emerging to test and treat asymptomatic persons for urogenital CT (‘Controversy 1’) and pharyngeal or rectal CT (‘Controversy 2’), whereby testing symptomatic persons is not under debate. Opposed views in CT treatment involve using azithromycin versus doxycycline (‘Controversy 3’). The objective of this review is to provide coverage of these public health and clinical controversies by reviewing the current scientific evidence. Methods A literature search was performed using PubMed for relevant publications between 2018 and September 2021, and iterative retrieval of additional relevant publications. Results Controversy 1. In women, the majority of asymptomatic CT are at the urogenital site, and detections mostly include viable CT. CT easily transmits to a partner and potentially also between the vaginal and rectal areas; the clinical impact of urogenital CT is established, although risks for adverse outcomes are uncertain. Wide-scale testing in asymptomatic women has not resulted in reduced prevalence. In MSM, evidence for the clinical impact of asymptomatic urogenital CT is lacking. Controversy 2. Rectal CT is common in women diagnosed with urogenital CT, but the clinical impact of asymptomatic rectal CT is uncertain. In MSM, rectal CT is common, and most CT infections are at the rectal site, yet the risk of longer term complications is unknown. In both sexes, pharyngeal CT is uncommon and has no documented clinical impact. Controversy 3. In the treatment of rectal CT, doxycycline has superior effectiveness to azithromycin. Evidence has also accumulated on the harms of test-and-treat strategies. Conclusions Current practices vary widely, from widescale test-and-treat approaches to more individual patient- and partner-level case management. Choosing which asymptomatic people to test at what anatomic site, and whether to test or not, requires an urgent (re-)definition of the goals of testing and treating asymptomatic persons. Treatment guidelines are shifting toward universal doxycycline use, and clinical practice now faces the challenge of implementation. Supplementary Information The online version contains supplementary material available at 10.1186/s12879-022-07171-2. Test-and-treat is a key strategy in the control of Chlamydia trachomatis (CT). We discuss recent controversies and present scientific evidence regarding urogenital, rectal, and pharyngeal CT test-and-treat strategies in women and in men who have sex with men (MSM). This should inform best practices for the prevention and management of the most common bacterial sexually transmitted infection (STI) worldwide.
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Affiliation(s)
- Nicole H T M Dukers-Muijrers
- Department of Sexual Health, Infectious Diseases, and Environmental Health, South Limburg Public Health Service, PO Box 33, 6400 AA, Heerlen, The Netherlands. .,Department of Health Promotion, Care and Public Health Research Institute (CAPHRI), Maastricht University Medical Center (MUMC+), Maastricht, The Netherlands.
| | - Ymke J Evers
- Department of Sexual Health, Infectious Diseases, and Environmental Health, South Limburg Public Health Service, PO Box 33, 6400 AA, Heerlen, The Netherlands.,Department of Social Medicine, Care and Public Health Research Institute (CAPHRI), Maastricht University Medical Center (MUMC+), Maastricht, The Netherlands
| | - Christian J P A Hoebe
- Department of Sexual Health, Infectious Diseases, and Environmental Health, South Limburg Public Health Service, PO Box 33, 6400 AA, Heerlen, The Netherlands.,Department of Social Medicine, Care and Public Health Research Institute (CAPHRI), Maastricht University Medical Center (MUMC+), Maastricht, The Netherlands.,Department of Medical Microbiology, Care and Public Health Research Institute (CAPHRI), Maastricht University Medical Center (MUMC+), Maastricht, The Netherlands
| | - Petra F G Wolffs
- Department of Medical Microbiology, Care and Public Health Research Institute (CAPHRI), Maastricht University Medical Center (MUMC+), Maastricht, The Netherlands
| | - Henry J C de Vries
- Epidemiology and Surveillance Unit, Centre for Infectious Disease Control, National Institute of Public Health and the Environment (RIVM), Bilthoven, The Netherlands.,Department of Infectious Diseases, Public Health Service of Amsterdam (GGD Amsterdam), Amsterdam, The Netherlands.,Department of Dermatology, Amsterdam Infection & Immunity Institute (AII), Amsterdam University Medical Center (UMC), Amsterdam, The Netherlands
| | - Bernice Hoenderboom
- Epidemiology and Surveillance Unit, Centre for Infectious Disease Control, National Institute of Public Health and the Environment (RIVM), Bilthoven, The Netherlands.,Institute for Public Health Genomics, Genetics & Cell Biology, Maastricht University, Faculty of Health and Medicine and Life Sciences, Maastricht, The Netherlands
| | - Marianne A B van der Sande
- Department of Public Health, Institute of Tropical Medicine, Antwerp, Belgium.,Global Health, Julius Centre for Health Sciences and Primary Care, UMC Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Janneke Heijne
- Epidemiology and Surveillance Unit, Centre for Infectious Disease Control, National Institute of Public Health and the Environment (RIVM), Bilthoven, The Netherlands
| | - Jeffrey D Klausner
- Department of Population and Public Health Sciences, Keck School of Medicine of the University of Southern California, Los Angeles, USA
| | - Jane S Hocking
- Melbourne School of Population and Global Health, University of Melbourne, Parkville, Victoria, Australia
| | - Jan van Bergen
- Epidemiology and Surveillance Unit, Centre for Infectious Disease Control, National Institute of Public Health and the Environment (RIVM), Bilthoven, The Netherlands.,Department of General Practice, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands.,STI AIDS Netherlands, Amsterdam, The Netherlands
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7
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Lewis J, White PJ, Price MJ. Per-partnership transmission probabilities for Chlamydia trachomatis infection: evidence synthesis of population-based survey data. Int J Epidemiol 2021; 50:510-517. [PMID: 33349846 PMCID: PMC8128448 DOI: 10.1093/ije/dyaa202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/25/2020] [Indexed: 11/14/2022] Open
Abstract
Background Chlamydia is the most commonly diagnosed sexually transmitted infection worldwide. Mathematical models used to plan and assess control measures rely on accurate estimates of chlamydia’s natural history, including the probability of transmission within a partnership. Several methods for estimating transmission probability have been proposed, but all have limitations. Methods We have developed a new model for estimating per-partnership chlamydia transmission probabilities from infected to uninfected individuals, using data from population-based surveys. We used data on sexual behaviour and prevalent chlamydia infection from the second UK National Study of Sexual Attitudes and Lifestyles (Natsal-2) and the US National Health and Nutrition Examination Surveys 2009–2014 (NHANES) for Bayesian inference of average transmission probabilities, across all new heterosexual partnerships reported. Posterior distributions were estimated by Markov chain Monte Carlo sampling using the Stan software. Results Posterior median male-to-female transmission probabilities per partnership were 32.1% [95% credible interval (CrI) 18.4–55.9%] (Natsal-2) and 34.9% (95%CrI 22.6–54.9%) (NHANES). Female-to-male transmission probabilities were 21.4% (95%CrI 5.1–67.0%) (Natsal-2) and 4.6% (95%CrI 1.0–13.1%) (NHANES). Posterior predictive checks indicated a well-specified model, although there was some discrepancy between reported and predicted numbers of partners, especially in women. Conclusions The model provides statistically rigorous estimates of per-partnership transmission probability, with associated uncertainty, which is crucial for modelling and understanding chlamydia epidemiology and control. Our estimates incorporate data from several sources, including population-based surveys, and use information contained in the correlation between number of partners and the probability of chlamydia infection. The evidence synthesis approach means that it is easy to include further data as it becomes available.
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Affiliation(s)
- Joanna Lewis
- MRC Centre for Global Infectious Disease Analysis and National Institute for Health Research (NIHR) Health Protection Research Unit in Modelling and Health Economics, Imperial College London School of Public Health, London, UK.,Centre for Applied Statistics Courses, UCL Great Ormond Street Institute of Child Health, University College London, London, UK
| | - Peter J White
- MRC Centre for Global Infectious Disease Analysis and National Institute for Health Research (NIHR) Health Protection Research Unit in Modelling and Health Economics, Imperial College London School of Public Health, London, UK.,Modelling and Economics Unit, National Infection Service, Public Health England, London, UK
| | - Malcolm J Price
- Institute of Applied Health Research, University of Birmingham, Birmingham, UK.,NIHR Birmingham Biomedical Research Centre, University Hospitals Birmingham NHS Foundation Trust and University of Birmingham, Birmingham, UK
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8
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Understanding Relationships Between Chlamydial Infection, Symptoms, and Testing Behavior: An Analysis of Data from Natsal-3. Epidemiology 2021; 31:263-271. [PMID: 31794495 PMCID: PMC7004460 DOI: 10.1097/ede.0000000000001150] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Supplemental Digital Content is available in the text. Genital chlamydia is the most commonly diagnosed sexually transmitted infection worldwide and can have serious long-term sequelae. Numerous countries invest substantially in testing but evidence for programs’ effectiveness is inconclusive. It is important to understand the effects of testing programs in different groups of people.
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9
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Voirin N, Allam C, Charre C, Fernandez C, Godinot M, Oria F, Pansu A, Chidiac C, Salord H, Cotte L. Optimizing Strategies for Chlamydia trachomatis and Neisseria gonorrhoeae Screening in Men Who Have Sex With Men: A Modeling Study. Clin Infect Dis 2021; 70:1966-1972. [PMID: 31198933 DOI: 10.1093/cid/ciz510] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Accepted: 06/13/2019] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND International guidelines recommend the systematic screening for Neisseria gonorrhoeae (NG) and Chlamydia trachomatis (CT) infections in all men who have sex with men (MSM) who have engaged in unprotected sex. However, the optimal screening strategy remains unclear. We developed a modeling approach to optimize NG/CT screening strategy in MSM. METHODS A compartmental model of NG/CT screening and infection was implemented. NG/CT anal, pharyngeal, and urine (APU) samples from MSM attending the sexually transmitted infections clinic were used to estimate the screening rate, prevalence, and incidence in a base case scenario. Different screening strategies (scenarios; S) were then evaluated: APU samples every 12 months (S1); APU samples every 3 months (S2); APU samples every 6 months (S3); anal and pharyngeal (AP) samples every 6 months (S4); and AP samples every 3 months (S5). RESULTS We analyzed 2973 triplet APU samples from 1255 patients. We observed 485 NG and 379 CT diagnoses. NG/CT prevalence and incidence estimates were 12.0/11.1% and 40/29 per 100 person-years, respectively, in the base case scenario. As compared to S2, the reference strategy, the proportions of missed NG/CT diagnoses were 42.0/41.2% with S1, 21.8/22.5% with S3, 25.6/28.3% with S4, and 6.3/10.5% with S5, respectively. As compared to S2, S1 reduced the cost of the analysis by 74%, S3 by 50%, S4 by 66%, and S5 by 33%. The numbers needed to screen for catching up the missed NG/CT diagnoses were 49/67 with S1, 62/82 with S3, 71/87 with S4, and 143/118 with S5. CONCLUSIONS S5 appears to be the best strategy, missing only 6.3/10.5% of NG/CT diagnoses, for a cost reduction of 33%.
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Affiliation(s)
- Nicolas Voirin
- EPIdemiology and MODelling of Infectious Diseases, Dompierre sur Veyle, Villeurbanne
| | - Camille Allam
- Bacteriology Laboratory, Hospices Civils de Lyon, Villeurbanne.,University of Lyon, Université Claude Bernard Lyon1, Villeurbanne.,Centre International de Recherche en Infectiologie, Institut National de la Santé et de la Recherche Médicale, Unité 1111, Centre National de la Recherche Scientifique, Unité Mixte de Recherche, Lyon, France
| | - Caroline Charre
- University of Lyon, Université Claude Bernard Lyon1, Villeurbanne.,Centre International de Recherche en Infectiologie, Institut National de la Santé et de la Recherche Médicale, Unité 1111, Centre National de la Recherche Scientifique, Unité Mixte de Recherche, Lyon, France.,Virology Laboratory, Hospices Civils de Lyon, Hospices Civils de Lyon, Lyon, France
| | - Christine Fernandez
- Centres Gratuits d'Information, de Dépistage et de Diagnostic Croix-Rousse, Hospices Civils de Lyon, Lyon, France
| | - Matthieu Godinot
- Centres Gratuits d'Information, de Dépistage et de Diagnostic Croix-Rousse, Hospices Civils de Lyon, Lyon, France
| | - Fatima Oria
- Centres Gratuits d'Information, de Dépistage et de Diagnostic Croix-Rousse, Hospices Civils de Lyon, Lyon, France
| | - Aymeric Pansu
- Centres Gratuits d'Information, de Dépistage et de Diagnostic Croix-Rousse, Hospices Civils de Lyon, Lyon, France
| | - Christian Chidiac
- University of Lyon, Université Claude Bernard Lyon1, Villeurbanne.,Department of Infectious Diseases, Hospices Civils de Lyon, Lyon, France
| | - Hélène Salord
- Bacteriology Laboratory, Hospices Civils de Lyon, Villeurbanne
| | - Laurent Cotte
- Centres Gratuits d'Information, de Dépistage et de Diagnostic Croix-Rousse, Hospices Civils de Lyon, Lyon, France.,Department of Infectious Diseases, Hospices Civils de Lyon, Lyon, France.,Institut National de la Santé et de la Recherche Médicale, Lyon, France
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10
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Chen X, Gan Y, Chang D, Mi X, Liu D. Availability of Chlamydia trachomatis Testing and Its Importance in the Surveillance of Genital Chlamydial Infection. Jpn J Infect Dis 2020; 74:209-213. [PMID: 33132299 DOI: 10.7883/yoken.jjid.2020.504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The reported prevalence of genital Chlamydia trachomatis infection (GCTI) is much lower in low-income countries than that in high-income countries. This study surveyed the prevalence of GCTI in 456 hospitals in Shandong province, China in December 2018. Among the hospitals surveyed, antigen testing, PCR testing, and either antigen or PCR testing were available in 200 (43.9%), 88 (19.3%), and 268 (58.8%) hospitals, respectively. PCR testing was more available in tertiary hospitals than in primary and secondary hospitals (χ2 = 28.560, P = 0.000). Significant differences were observed in the availability of antigen testing (χ2 = 15.708, P = 0.003), PCR testing (χ2 = 22.494, P = 0.000), and either antigen or PCR testing (χ2 = 21.729, P = 0.000) among different types of hospitals. In 2018, 1532 cases of GCTI were reported in 99 hospitals. Tertiary hospitals reported more cases than those in primary and secondary hospitals (χ2 = 24.082, P = 0.000). The distribution of different types of hospitals that reported GCTI cases was consistent with that of hospitals that provided laboratory testing for GCTI. Antigen and PCR testing were only available in 200 (43.9%) and 88 (19.3%) hospitals, respectively. The results highlighted that the availability of laboratory testing for GCTI in Shandong province was poor, suggesting that the prevalence of GCTI in the province had been sorely underestimated.
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Affiliation(s)
- Xinlong Chen
- Hospital of Chengdu University of Traditional Chinese Medicine, China.,Shandong Provincial Hospital for Skin Diseases and Shandong Provincial Institute of Dermatology and Venereology, Shandong First Medical University and Shandong Academy of Medical Sciences, China
| | - Yanling Gan
- Shandong Provincial Hospital for Skin Diseases and Shandong Provincial Institute of Dermatology and Venereology, Shandong First Medical University and Shandong Academy of Medical Sciences, China
| | - Degui Chang
- Hospital of Chengdu University of Traditional Chinese Medicine, China
| | - Xiongfei Mi
- Hospital of Chengdu University of Traditional Chinese Medicine, China
| | - Dianchang Liu
- Shandong Provincial Hospital for Skin Diseases and Shandong Provincial Institute of Dermatology and Venereology, Shandong First Medical University and Shandong Academy of Medical Sciences, China
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11
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Lecky DM, Granier S, Allison R, Verlander NQ, Collin SM, McNulty CAM. Infectious Disease and Primary Care Research-What English General Practitioners Say They Need. Antibiotics (Basel) 2020; 9:E265. [PMID: 32443700 PMCID: PMC7277096 DOI: 10.3390/antibiotics9050265] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 05/15/2020] [Accepted: 05/18/2020] [Indexed: 11/21/2022] Open
Abstract
BACKGROUND Infections are one of the most common reasons for patients attending primary care. Antimicrobial resistance (AMR) is perhaps one of the biggest threats to modern medicine; data show that 81% of antibiotics in the UK are prescribed in primary care. AIM To identify where the perceived gaps in knowledge, skills, guidance and research around infections and antibiotic use lie from the general practitioner (GP) viewpoint. DESIGN AND SETTING An online questionnaire survey. METHOD The survey, based on questions asked of Royal College of General Practitioners (RCGP) members in 1999, and covering letter were electronically sent to GPs between May and August 2017 via various primary care dissemination routes. RESULTS Four hundred and twenty-eight GPs responded. Suspected Infection in the elderly, recurrent urinary tract infection (UTI), surveillance of AMR in the community, leg ulcers, persistent cough and cellulitis all fell into the top six conditions ranked in order of importance that require further research, evidence and guidance. Acute sore throat, otitis media and sinusitis were of lower importance than in 1999. CONCLUSION This survey will help the NHS, the UK National Institute for Health and Care Excellence (NICE) and researchers to prioritise for the development of guidance and research for chronic conditions highlighted for which there is little evidence base for diagnostic and management guidelines in primary care. In contrast, 20 years of investment into research, guidance and resources for acute respiratory infections have successfully reduced these as priority areas for GPs.
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Affiliation(s)
- Donna M. Lecky
- Primary Care and Interventions Unit, Public Health England, Gloucester GL1 1DQ, UK; (R.A.); (C.A.M.M.)
| | | | - Rosalie Allison
- Primary Care and Interventions Unit, Public Health England, Gloucester GL1 1DQ, UK; (R.A.); (C.A.M.M.)
| | - Neville Q. Verlander
- Statistics, Modelling and Economics Department, Public Health England, London NW9 5EQ, UK;
| | - Simon M. Collin
- HCAI & AMR Division, Public Health England, London NW9 5EQ, UK;
| | - Cliodna A. M. McNulty
- Primary Care and Interventions Unit, Public Health England, Gloucester GL1 1DQ, UK; (R.A.); (C.A.M.M.)
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12
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Has Chlamydia trachomatis prevalence in young women in England, Scotland and Wales changed? Evidence from national probability surveys. Epidemiol Infect 2020; 147:e107. [PMID: 30869031 PMCID: PMC6518515 DOI: 10.1017/s0950268819000347] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
We evaluate the utility of the National Surveys of Attitudes and Sexual Lifestyles (Natsal) undertaken in 2000 and 2010, before and after the introduction of the National Chlamydia Screening Programme, as an evidence source for estimating the change in prevalence of Chlamydia trachomatis (CT) in England, Scotland and Wales. Both the 2000 and 2010 surveys tested urine samples for CT by Nucleic Acid Amplification Tests (NAATs). We examined the sources of uncertainty in estimates of CT prevalence change, including sample size and adjustments for test sensitivity and specificity, survey non-response and informative non-response. In 2000, the unadjusted CT prevalence was 4.22% in women aged 18–24 years; in 2010, CT prevalence was 3.92%, a non-significant absolute difference of 0.30 percentage points (95% credible interval −2.8 to 2.0). In addition to uncertainty due to small sample size, estimates were sensitive to specificity, survey non-response or informative non-response, such that plausible changes in any one of these would be enough to either reverse or double any likely change in prevalence. Alternative ways of monitoring changes in CT incidence and prevalence over time are discussed.
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13
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Macaya A, Guardia Hernández JJ, Nuevo P. Data confidentiality, professional secret and contact research in sexually transmitted infections. Med Clin (Barc) 2020; 154:366-369. [PMID: 32113696 DOI: 10.1016/j.medcli.2019.11.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 10/30/2019] [Accepted: 11/07/2019] [Indexed: 10/24/2022]
Affiliation(s)
- Antonio Macaya
- Universitat Internacional de Catalunya, Servicio de Dermatología y Venereología del Hospital Universitari de Bellvitge, Barcelona, España.
| | | | - Pablo Nuevo
- Facultad de Derecho, Universitat Abat Oliba- CEU de Barcelona, Barcelona, España
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14
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Abraham S, Juel HB, Bang P, Cheeseman HM, Dohn RB, Cole T, Kristiansen MP, Korsholm KS, Lewis D, Olsen AW, McFarlane LR, Day S, Knudsen S, Moen K, Ruhwald M, Kromann I, Andersen P, Shattock RJ, Follmann F. Safety and immunogenicity of the chlamydia vaccine candidate CTH522 adjuvanted with CAF01 liposomes or aluminium hydroxide: a first-in-human, randomised, double-blind, placebo-controlled, phase 1 trial. THE LANCET. INFECTIOUS DISEASES 2019; 19:1091-1100. [DOI: 10.1016/s1473-3099(19)30279-8] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Revised: 04/30/2019] [Accepted: 05/22/2019] [Indexed: 12/18/2022]
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15
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White PJ, Lewis J. Letter to editor in response to Has Chlamydia trachomatis prevalence in young women in England, Scotland and Wales changed? Evidence from national probability surveys. Epidemiol Infect 2019; 147:e271. [PMID: 31537203 PMCID: PMC6805731 DOI: 10.1017/s0950268819001572] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
Affiliation(s)
- P. J. White
- MRC Centre for Global Infectious Disease Analysis and NIHR Health Protection Research Unit in Modelling Methodology, Imperial College London, London, UK
- Modelling and Economics Unit, National Infection Service, Public Health England, London, UK
| | - J. Lewis
- MRC Centre for Global Infectious Disease Analysis and NIHR Health Protection Research Unit in Modelling Methodology, Imperial College London, London, UK
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16
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[Response to Kounali et al.'s letter of response]. Epidemiol Infect 2019; 147:e273. [PMID: 31537206 PMCID: PMC6805763 DOI: 10.1017/s0950268819001584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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17
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Smid J, Althaus CL, Low N. Discrepancies between observed data and predictions from mathematical modelling of the impact of screening interventions on Chlamydia trachomatis prevalence. Sci Rep 2019; 9:7547. [PMID: 31101863 PMCID: PMC6525258 DOI: 10.1038/s41598-019-44003-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Accepted: 04/26/2019] [Indexed: 11/09/2022] Open
Abstract
Mathematical modelling studies of C. trachomatis transmission predict that interventions to screen and treat chlamydia infection will reduce prevalence to a greater degree than that observed in empirical population-based studies. We investigated two factors that might explain this discrepancy: partial immunity after natural infection clearance and differential screening coverage according to infection risk. We used four variants of a compartmental model for heterosexual C. trachomatis transmission, parameterized using data from England about sexual behaviour, C. trachomatis testing, diagnosis and prevalence, and Markov Chain Monte Carlo methods for statistical inference. In our baseline scenario, a model in which partial immunity follows natural infection clearance and the proportion of tests done in chlamydia-infected people decreases over time fitted the data best. The model predicts that partial immunity reduced susceptibility to reinfection by 68% (95% Bayesian credible interval 46-87%). The estimated screening rate was 4.3 (2.2-6.6) times higher for infected than for uninfected women in 2000, decreasing to 2.1 (1.4-2.9) in 2011. Despite incorporation of these factors, the model still predicted a marked decline in C. trachomatis prevalence. To reduce the gap between modelling and data, advances are needed in knowledge about factors influencing the coverage of chlamydia screening, the immunology of C. trachomatis and changes in C. trachomatis prevalence at the population level.
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Affiliation(s)
- Joost Smid
- Institute of Social and Preventive Medicine (ISPM), University of Bern, Bern, Switzerland
| | - Christian L Althaus
- Institute of Social and Preventive Medicine (ISPM), University of Bern, Bern, Switzerland.
| | - Nicola Low
- Institute of Social and Preventive Medicine (ISPM), University of Bern, Bern, Switzerland
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18
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Assessing local chlamydia screening performance by combining survey and administrative data to account for differences in local population characteristics. Sci Rep 2019; 9:7070. [PMID: 31068656 PMCID: PMC6506589 DOI: 10.1038/s41598-019-43521-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Accepted: 04/18/2019] [Indexed: 11/08/2022] Open
Abstract
Reducing health inequalities requires improved understanding of the causes of variation. Local-level variation reflects differences in local population characteristics and health system performance. Identifying low- and high-performing localities allows investigation into these differences. We used Multilevel Regression with Post-stratification (MRP) to synthesise data from multiple sources, using chlamydia testing as our example. We used national probability survey data to identify individual-level characteristics associated with chlamydia testing and combined this with local-level census data to calculate expected levels of testing in each local authority (LA) in England, allowing us to identify LAs where observed chlamydia testing rates were lower or higher than expected, given population characteristics. Taking account of multiple covariates, including age, sex, ethnicity, student and cohabiting status, 5.4% and 3.5% of LAs had testing rates higher than expected for 95% and 99% posterior credible intervals, respectively; 60.9% and 50.8% had rates lower than expected. Residual differences between observed and MRP expected values were smallest for LAs with large proportions of non-white ethnic populations. London boroughs that were markedly different from expected MRP values (≥90% posterior exceedance probability) had actively targeted risk groups. This type of synthesis allows more refined inferences to be made at small-area levels than previously feasible.
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19
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Soldan K, Dunbar JK, Gill ON. Estimating chlamydia prevalence: more difficult than modelling suggests. LANCET PUBLIC HEALTH 2019; 3:e416. [PMID: 30193695 DOI: 10.1016/s2468-2667(18)30166-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Accepted: 08/22/2018] [Indexed: 11/18/2022]
Affiliation(s)
- Kate Soldan
- National Chlamydia Screening Programme, HIV & STI Department, National Infection Service, Public Health England.
| | - J Kevin Dunbar
- National Chlamydia Screening Programme, HIV & STI Department, National Infection Service, Public Health England
| | - O Noel Gill
- National Chlamydia Screening Programme, HIV & STI Department, National Infection Service, Public Health England
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20
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Eaton S, Biggerstaff D, Petrou S, Osipenko L, Gibbs J, Estcourt CS, Sadiq T, Szczepura A. Young people's preferences for the use of emerging technologies for asymptomatic regular chlamydia testing and management: a discrete choice experiment in England. BMJ Open 2019; 9:e023663. [PMID: 30700477 PMCID: PMC6352830 DOI: 10.1136/bmjopen-2018-023663] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 10/30/2018] [Accepted: 11/05/2018] [Indexed: 11/09/2022] Open
Abstract
OBJECTIVE To undertake a comprehensive assessment of the strength of preferences among young people for attributes of emerging technologies for testing and treatment of asymptomatic chlamydia. DESIGN Discrete choice experiment (DCE) with sequential mixed methods design. A staged approach to selection of attributes/levels included two literature reviews, focus groups with young people aged 16-24 years (n=21), experts' review (n=13) and narrative synthesis. Cognitive testing was undertaken to pilot and adapt the initial questionnaire. Online national panel was used for final DCE survey to maximise generalisability. Analysis of questionnaire responses used multinomial logit models and included validity checks. SETTING England. PARTICIPANTS 1230 young people aged 16-24 from a national online panel (completion rate 73%). OUTCOME MEASURES ORs for service attributes in relation to reference levels. RESULTS The strongest attribute influencing preferences was chlamydia test accuracy (OR 3.24, 95% CI 3.13 to 3.36), followed by time to result (OR 1.81, 95% CI 1.71 to 1.91). Respondents showed a preference for remote chlamydia testing options (self-testing, self-sampling and postal testing) over attendance at a testing location. For accessing treatment following a positive test result, there was a general preference for online (OR 1.21, 95% CI 1.15 to 1.28) versus traditional general practitioner (OR 1.18, 95% CI 1.12 to 1.24) or pharmacy (OR 1.15, 95% CI 1.10 to 1.22) over clinic services. For accessing a healthcare professional and receipt of antibiotics, there was little difference in preferences between options. CONCLUSIONS Both test accuracy and very short intervals between testing and results were important factors for young people when deciding whether to undergo a routine test for asymptomatic chlamydia, with test accuracy being more important. These findings should assist technology developers, policymakers, commissioners and service providers to optimise technology adoption in service redesign, although use of an online panel may limit generalisability of findings to other populations.
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Affiliation(s)
- Sue Eaton
- Warwick Medical School, University of Warwick, Coventry, UK
| | | | - Stavros Petrou
- Warwick Medical School, University of Warwick, Coventry, UK
| | - Leeza Osipenko
- Scientific Advice, National Institute for Health and Care Excellence, London, UK
| | - Jo Gibbs
- Research Department of Infection and Population Health, University College London, London, UK
| | | | - Tariq Sadiq
- Applied Diagnostic Research and Evaluation Unit, Institute for Infection and Immunity, St George’s University of London, London, UK
| | - Ala Szczepura
- Enterprise and Innovation Group, Coventry University, Coventry, UK
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21
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White PJ, Lewis PJ. Estimating chlamydia prevalence: more difficult than modelling suggests - Authors' reply. LANCET PUBLIC HEALTH 2018; 3:e417. [PMID: 30193696 DOI: 10.1016/s2468-2667(18)30129-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Accepted: 06/18/2018] [Indexed: 11/30/2022]
Affiliation(s)
- Peter J White
- MRC Centre for Outbreak Analysis and Modelling and NIHR Health Protection Research Unit in Modelling Methodology, Imperial College London, London, UK; Modelling and Economics Unit, National Infection Service, Public Health England, London, UK.
| | - P Joanna Lewis
- MRC Centre for Outbreak Analysis and Modelling and NIHR Health Protection Research Unit in Modelling Methodology, Imperial College London, London, UK
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22
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Whittles LK, White PJ, Paul J, Didelot X. Epidemiological Trends of Antibiotic Resistant Gonorrhoea in the United Kingdom. Antibiotics (Basel) 2018; 7:antibiotics7030060. [PMID: 30011825 PMCID: PMC6165062 DOI: 10.3390/antibiotics7030060] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 07/06/2018] [Accepted: 07/11/2018] [Indexed: 11/16/2022] Open
Abstract
Gonorrhoea is one of the most common sexually-transmitted bacterial infections, globally and in the United Kingdom. The levels of antibiotic resistance in gonorrhoea reported in recent years represent a critical public health issue. From penicillins to cefixime, the gonococcus has become resistant to all antibiotics that have been previously used against it, in each case only a matter of years after introduction as a first-line therapy. After each instance of resistance emergence, the treatment recommendations have required revision, to the point that only a few antibiotics can reliably be prescribed to treat infected individuals. Most countries, including the UK, now recommend that gonorrhoea be treated with a dual therapy combining ceftriaxone and azithromycin. While this treatment is still currently effective for the vast majority of cases, there are concerning signs that this will not always remain the case, and there is no readily apparent alternative. Here, we review the use of antibiotics and epidemiological trends of antibiotic resistance in gonorrhoea from surveillance data over the past 15 years in the UK and describe how surveillance could be improved.
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Affiliation(s)
- Lilith K Whittles
- Department of Infectious Disease Epidemiology, School of Public Health, Imperial College London, London W2 1PG, UK.
| | - Peter J White
- Department of Infectious Disease Epidemiology, School of Public Health, Imperial College London, London W2 1PG, UK.
- MRC Centre for Outbreak Analysis and Modelling, School of Public Health, Imperial College London, London W2 1PG, UK.
- NIHR Health Protection Research Unit in Modelling Methodology, School of Public Health, Imperial College London, London W2 1PG, UK.
- Modelling and Economics Unit, National Infection Service, Public Health England, London NW9 5EQ, UK.
| | - John Paul
- Department of Microbiology, Public Health England Collaborative Centre, Royal Sussex County Hospital, Brighton BN2 5BE, UK.
- Department of Global Health and Infection, Brighton and Sussex Medical School, University of Sussex, Falmer BN1 9PH, UK.
| | - Xavier Didelot
- Department of Infectious Disease Epidemiology, School of Public Health, Imperial College London, London W2 1PG, UK.
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23
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Impact of screening on chlamydia infections. Drug Ther Bull 2018; 56:76-77. [PMID: 29970588 DOI: 10.1136/dtb.2018.7.0643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
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24
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Low N, Smid JH. Changes in chlamydia prevalence over time: how to observe the unobserved. Lancet Public Health 2018; 3:e260-e261. [PMID: 29776797 DOI: 10.1016/s2468-2667(18)30092-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 04/26/2018] [Indexed: 11/22/2022]
Affiliation(s)
- Nicola Low
- Institute of Social and Preventive Medicine, University of Bern, 3012 Bern, Switzerland.
| | - Joost H Smid
- Institute of Social and Preventive Medicine, University of Bern, 3012 Bern, Switzerland
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