Risk factors for sexually transmitted infections in sexual assault victims attending an Accident and Emergency Department in Hong Kong

Objective: The prevalence of sexually transmitted infections in Hong Kong is not high. The objective of this study was to determine the risk factors that associated with occurrence of sexually transmitted infections in local sexual assault victims, so as to facilitate the counseling and management of victims upon their initial attendance at an Accident and Emergency Department. Methods: This was a retrospective cohort of sexual assault victims presented to Accident and Emergency Department of Kwong Wah Hospital between 1 January 2016 and 31 December 2021. The outcome was the occurrence of sexually transmitted infections. Variables were analyzed using univariate and multivariable analyses. Results: A total of 190 victims were included in the study. Univariate analysis indicated that sexual assault involving multiple perpetrator, oral penetration, and anal penetration were associated with increased occurrence of sexually transmitted infections in the victims (all with p < 0.05). Among these, multiple perpetrator was the only statistically significant risk factor on multivariable analysis (p < 0.05). Conclusion: Multiple-perpetrator sexual assault was identified as a significant risk factor of sexually transmitted infections. Emergency physicians should consider explaining to victims of multiple-perpetrator sexual assault that they have a higher risk of contracting sexually transmitted infections and emphasizing on the importance of complying with medical treatments, attending follow-up and observing symptoms of sexually transmitted infections. Proper clinical assessment, adequate follow-up, and reassurance for the victims with lower likelihood of contracting sexually transmitted infections are suggested for managing sexual assault victims.