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Diagnosis of Chlamydia trachomatis, Neisseria gonorrhoeae, Trichomonas vaginalis, and Mycoplasma genitalium; an observational study of testing patterns, prevalence, and co-infection rates in northern New Zealand.

Arlo Upton , Liselle Bissessor , Peter Lowe , Xiaoying Wang , Gary McAuliffe


Background We sought to determine community prevalence, epidemiology and testing patterns for sexually transmitted infections (STI) in northern New Zealand. Methods 2643 samples submitted for STI testing between 26th November 2015 and 7th December 2015 underwent analysis by Aptima Combo 2, Trichomonas vaginalis, and Mycoplasma genitalium assays. Results were analysed by patient demographics. Results 411 pathogens were detected from 359 patients, with C. trachomatis (CT), N. gonorrhoeae (NG), T. vaginalis (TV), and M. genitalium (MG) detected in 178 (6.7%), 19 (0.7%), 80 (3%) and 134 (5.1%) of samples respectively. With the exception of TV, STI prevalence was highest in those <25 years of age. Infection was more common in males for NG (OR 5.05, P <0.001) and CT (OR 2.72, P <0.001). Maori and Pacific ethnicity were associated with increased risk of MG (OR 1.82, P 0.006,) TV (OR 6.1, P <0.001) and CT (OR 3.31, P <0.001) infection, and TV and NG infections were more prevalent with increasing social deprivation. A mismatch between testing rates and prevalence of infection was seen with less tests performed in males (OR 0.2, P <0.001) compared with females, and no difference in testing of Maori/Pacific men (3064/100,000) compared with European men (3181/100,000, OR 0.96, P 0.76) despite an increased risk of disease. Conclusions We describe the epidemiology of STIs in our community and identify a previously un-reported burden of M. genitalium infection. We also establish that there are disparately low testing rates for STIs in certain high risk groups.

SH17110  Accepted 03 October 2017

© CSIRO 2017