The Proportion of Coinfections Among Sexually Transmitted Infections in Japan: A Nationwide Claims Database Study

Area of Science:

• Epidemiology
• Public Health
• Infectious Diseases

Background:

• Rising global incidence of sexually transmitted infections (STIs) necessitates understanding coinfection patterns.
• Limited research exists on the prevalence of coinfections within large populations.
• This study addresses the gap by analyzing coinfection proportions across multiple STIs.

Purpose of the Study:

• To estimate the proportions of coinfections among various STIs.
• To identify demographic groups with higher coinfection rates.
• To inform public health strategies for STI prevention and control.

Main Methods:

• A descriptive epidemiologic study utilizing a Japanese nationwide health insurance claims database (April 2013–December 2020).
• Included five STIs: syphilis, genital chlamydia, gonorrhea, genital herpes, and genital warts.
• Analyzed coinfection proportions in individuals aged 15–49 years.

Main Results:

• Coinfection proportions were highest in younger age groups (15–19 and 20–29 years).
• Significant coinfection rates observed, e.g., genital chlamydia with gonorrhea (33.8%–40.8%) and syphilis with gonorrhea in young females (up to 9.0%).
• Specific coinfection pairs like syphilis/genital herpes and genital warts/chlamydia showed notable prevalence.

Conclusions:

• Findings emphasize the critical need for targeted STI screening and prompt diagnosis.
• Results offer valuable data for clinicians and policymakers to enhance STI prevention and management.
• Integrated approaches are crucial for reducing the burden of STI coinfections.