Sexual activity as a risk factor for hepatitis C.

Area of Science:

• Hepatology
• Virology
• Epidemiology

Background:

• Hepatitis C virus (HCV) transmission is increasingly recognized through sexual contact.
• While less efficient than hepatitis B virus (HBV) or human immunodeficiency virus (HIV), sexual HCV transmission contributes to the overall infection burden.
• Risk factors for sexual HCV transmission vary significantly based on relationship type and behaviors.

Purpose of the Study:

• To evaluate the efficiency and prevalence of sexual hepatitis C virus (HCV) transmission.
• To compare HCV transmission risks across different sexual relationship types and risk groups.
• To analyze the impact of HIV coinfection on sexual HCV transmission rates.

Main Methods:

• Review of accumulated evidence on HCV sexual transmission.
• Analysis of seroprevalence studies in various populations, including monogamous partners and individuals at risk for STDs.
• Comparison of HCV acquisition rates in different partnership types and geographical regions.

Main Results:

• Sexual transmission of HCV is less efficient than HBV or HIV but contributes to overall U.S. infection rates.
• HCV acquisition risk is lower in long-term monogamous partnerships (0%-0.6% annually) compared to individuals with multiple partners or STD risk (0.4%-1.8% annually).
• Seroprevalence of anti-HCV in monogamous heterosexual partners ranges from 0% to 11% globally, while it is 1.6% to 25.5% in STD-risk populations. HIV coinfection appears to increase sexual HCV transmission.

Conclusions:

• Sexual contact is a recognized, albeit less efficient, route for hepatitis C virus (HCV) transmission.
• Risk stratification for sexual HCV transmission is crucial, differentiating between monogamous relationships and higher-risk sexual behaviors.
• Current recommendations for sexual practices should be tailored to individual HCV infection status and relationship dynamics.