How Much Do Young Australians Know About Syphilis Compared With Chlamydia and Gonorrhea? Findings From an Online Survey.

Background: There is increased heterosexual transmission of syphilis in Australia, an infection with severe outcomes. Australian policy emphasizes increasing sexually transmissible infection knowledge/awareness. However, little is known about young Australians' perceptions and knowledge of syphilis.
Methods: Our online sexual health survey was open May 2 to June 21, 2022, to 16- to 29-year-olds in Australia. We asked participants if they were aware of syphilis, their personal risk perception, and perceived severity of infection and compared with results for chlamydia/gonorrhea. Multivariable and multinomial logistic regressions were used to assess characteristics associated with outcomes. We measured sexually transmissible infection knowledge using 10 true/false statements (5 syphilis, 5 chlamydia/gonorrhea).
Results: Among 2018 participants (69.1% women, 48.9% heterosexual), 91.3% had heard of syphilis (vs. 97.2% for chlamydia and 93.3% for gonorrhea). Older (25-29 years; adjusted odds ratio [aOR], 2.4; 95% confidence interval [CI], 1.4-4.4) and gay/lesbian (aOR, 2.8; 95% CI, 1.4-5.3) respondents were more likely to have heard of syphilis, as were those who were non-Aboriginal, sexually active, and with a school-based sex education. Syphilis knowledge was lower than chlamydia/gonorrhea knowledge ( P < 0.001). More than half (59.7%) perceived syphilis to have serious health impacts (vs. 36.4% for chlamydia and 42.3% for gonorrhea). Older respondents were more likely (25-29 years; aOR 2.1; 95% CI, 1.6-2.8), and gay/lesbian respondents less likely (aOR, 0.7; 95% CI, 0.6-1.0) to perceive syphilis to have serious health impacts. One-fifth of sexually active participants were unsure of their risk of syphilis.
Conclusions: Most young Australians are aware of syphilis, but few have comprehensive knowledge about the infection relative to chlamydia/gonorrhea. Considering increasing heterosexual transmission, syphilis health promotion campaigns should expand their focus.
Competing Interests: Conflict of Interest and Sources of Funding: J.S.H. is recipient of an National Health and Medical Research Council fellowship grant. All other authors report no conflicts of interest.
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