Impact of COVID-19 Service Interruptions and Behavior Changes on HCV and HIV in PWID

Overview

This modeling analysis examined how COVID-19-related service disruptions and behavioral shifts among people who inject drugs (PWID) influenced hepatitis C virus (HCV) and HIV transmission. While service interruptions increased disease prevalence, concurrent behavioral changes such as reduced injection networks and increased injection cessation mitigated these effects.

Background

The COVID-19 pandemic caused widespread disruptions to healthcare and harm-reduction services critical for PWID, including testing, treatment, and syringe service programs. These disruptions raised concerns about increased HCV and HIV transmission due to reduced access to prevention and care. However, behavioral adaptations among PWID, such as smaller drug-use networks and altered injection frequency, may have influenced transmission dynamics. Understanding these combined effects is essential for accurate disease burden estimation and intervention planning.

Data Highlights

Analysis of ALIVE cohort data revealed during the pandemic: an acceleration in injection cessation overall; increased injection frequency among those continuing to inject; smaller individual drug-use networks; and decreased probability of injecting with others. Simulation modeling showed that service disruptions alone increased HCV and HIV prevalence, but including observed behavioral changes offset much of this increase.

Key Findings

• COVID-19 service disruptions led to reduced access to HCV/HIV testing, treatment, and harm-reduction services among PWID.
• Behavioral data indicated an overall increase in injection cessation during the pandemic.
• Among PWID who continued injecting, injection frequency increased, but drug-use networks became smaller with less syringe sharing.
• Model simulations showed that service disruptions alone would increase HCV and HIV prevalence.
• Incorporating behavioral changes into models mitigated or offset the increased disease burden caused by service interruptions.
• Behavioral changes persisted longer than service disruptions, playing a critical role in transmission dynamics.

Clinical Implications

Clinicians and public health practitioners should consider both service availability and behavioral adaptations when assessing HCV and HIV risk among PWID during and after pandemic conditions. Maintaining and adapting harm-reduction services is essential, but recognizing behavioral shifts can inform targeted interventions to prevent outbreaks. Continuous monitoring of drug-use behaviors alongside service access is critical for effective disease control.

Conclusion

The study highlights that pandemic-induced behavioral changes among PWID can substantially mitigate the negative impact of COVID-19-related service disruptions on HCV and HIV transmission. Integrating behavioral data into transmission models improves understanding of disease dynamics and informs more effective public health responses.

References

1. Author/Source/Year -- Effects of COVID-19-Related Service Interruptions and Behavioral Shifts on the Transmission of Hepatitis C Virus and HIV Among Individuals Who Inject Drugs: A Modeling Analysis