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WPSWestern Pacific Surveillance and ResponseR Journal Volume 10, Number 4, 2019, Pages 1–50 p-ISSN: 2094-7321 e-ISSN: 2094-7313 ©WHO IN THIS ISSUE Original Research Case-control study of risk factors for incident syphilis infection among men who have sex with men in Tokyo, Japan 1 M Ishikane, Y Arima, I Itoda, T Yamagishi, T Takahashi, T Matsui, T Sunagawa, M Ohnishi, K Oishi Field epidemiology training programmes in the Asia-Pacific: what is the best practice for supervision? 9 O Forbes, S Davis, A Dyda, A Rosewell, S Williams, M Kirk, MC Roces, MC Lim-Quizon, K Viney Meteorological factors associated with hand, foot and mouth disease in a Central Highlands province in Viet Nam: an ecological study 18 Pham HV, Phan UTN, Pham ANQ Screening for latent tuberculosis infection by an Aboriginal Community Controlled Health Service, New South Wales, Australia, 2015 24 H Visser, M Passey, E Walke, S Devlin Spatial distribution of tuberculosis in a rural region of Western Province, Papua New Guinea 31 T Diefenbach-Elstob, V Guernier-Cambert, B Gula, R Dowi, D Pelowa, W Pomat, C Rush, D Plummer, E McBryde, J Warner Gap in measles vaccination coverage among children aged 9 months to 10 years in Ho Chi Minh City, Viet Nam 39 Western Pacific Surveillance and Response Hoang QC, Ho XN, Pham VH, Nguyen LKH, Phan TL, A Mounts, Tran Minh NN Open access journal with continuous publication Regional Analysis Western Pacific Surveillance and Response (WPSAR) is Diphtheria diagnostic capacity in the an open access journal dedicated to the surveillance of and Western Pacific Region 46 response to public health events. 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OriginalArticle Research type Case-control study of risk factors for incident syphilis infection among men who have sex with men in Tokyo, Japan Masahiro Ishikane,a,b,c Yuzo Arima,d Ichiro Itoda,e Takuya Yamagishi,d Takuri Takahashi,d Tamano Matsui,d Tomimasa Sunagawa,d Makoto Ohnishif and Kazunori Oishid Correspondence to Yuzo Arima (email: [email protected]) Introduction: In Japan, syphilis notifications have increased. Men who have sex with men (MSM) in Tokyo have contributed substantially to the increase in syphilis notifications. We thus aimed to determine the correlates of incident syphilis among them. Methods: MSM who attended a Tokyo clinic that serves sexual minorities were recruited in a case-control study in 2015. A case was seropositive for primary/secondary/asymptomatic syphilis at enrolment visit and seronegative at prior visit or had oral ulcers positive for Treponema pallidum DNA at enrolment. For each case, two controls seronegative at enrolment and prior visit were selected. Using logistic regression, odds ratios (ORs) and 95% confidence intervals (CIs) were estimated to assess for correlates of case status. Results: Among 35 cases, the median age was 37 (range = 21–63) years and was similar to the 71 controls. Among HIV-positive participants (26 cases and 67 controls), cases were independently associated with higher frequency of anal or oral sex (OR = 3.4; 95% CI = 1.4–8.6; increase per category from < 1/month, ≥ 1/month but < 1/week, to ≥ 1/ week) and no or inconsistent condom use during anal or oral sex (OR = 3.0; 95% CI = 1.1–8.3; increase per category from using every time, occasionally, to never), adjusted for residency and time between visits. Discussion: Modifiable behaviours were associated with incident syphilis, and dissemination of prevention messages are needed. yphilis, a nationally notifiable infectious disease Recent studies among MSM have reported that in Japan, has seen a considerable rise in the factors associated with syphilis were low educational Snumber of notifications,1,2 similar to many other attainment, sex with casual partners without a condom countries globally,3,4 including within the Western and coinfection with other sexually transmitted infections Pacific Region.5–7 In Japan, while more recent increases (STIs).10–13 Using mobile phone applications and the in syphilis have been among heterosexual men and Internet to seek partners has also been reported as a women,8 during 2013–2014, this increase was potential risk factor for STIs, including syphilis, among predominantly associated with men who have sex with MSM.14–16 While these and other practices have been men (MSM).1,2 The number of notifications among MSM suggested as possible contributors to the recent rise of remained high through 2018. Notably, both the absolute syphilis notifications in Japan, very few studies have number of reported MSM and heterosexual syphilis evaluated potential predictors for syphilis acquisition cases and the notification rate per population have in Japan. Recently, there was a cohort study analysing been highest in Tokyo (4 cases per 100 000 persons- the risk factors of incident syphilis infection among HIV- years during 2012–2016), contributing one third of the positive MSM in Japan,17 but behavioural factors were national cases.8,9 not assessed. To better understand the syphilis outbreak a Field Epidemiology Training Program, National Institute of Infectious Diseases, Tokyo, Japan. b Division of Global Infectious Diseases, Department of Infection and Epidemiology, Graduate School of Medicine, Tohoku University, Miyagi, Japan. c Department of Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan. d Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Tokyo, Japan. e Shirakaba Clinic, Tokyo, Japan. f Department of Bacteriology I, National Institute of Infectious Diseases, Tokyo, Japan. Submitted: 13 January 2019; Published: 9 December 2019 doi: 10.5365/wpsar.2019.10.1.003 https://ojs.wpro.who.int/ WPSAR Vol 10, No 4, 2019 | doi: 10.5365/wpsar.2019.10.1.003 1 Syphilis case-control study in Japan Ishikane et al among MSM in Tokyo, we conducted a clinic-based case- positive for T. pallidum DNA (polA/TpN47 genes) by poly- control study based on a self-administered questionnaire merase chain reaction (PCR)20,21 at the enrolment visit to assess the potential risk factors, including modifiable (PCR method available on a limited basis for research). behavioural factors, for incident syphilis. We excluded late stage and neurosyphilis cases because they likely would not reflect recent infection, and sexual MATERIALS AND METHODS activity within the recent six months would not be caus- ally related to such infections. Study design and setting Control subjects We conducted a case-control study at Shirakaba Clinic, a clinic that serves sexual minority populations. The clinic A control was defined as an eligible subject without evi- is located in the urban area of Tokyo, and most of the dence of recent syphilis infection.