Back to overview

Higher risk of incident hepatitis C virus coinfection among men who have sex with men, in whom the HIV genetic bottleneck at transmission was wide.

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Kouyos Roger D, Rauch Andri, Braun Dominique L, Yang Wan-Lin, Böni Jürg, Yerly Sabine, Klimkait Thomas, Aubert Vincent, Shah Cyril, Kovari Helen, Calmy Alexandra, Cavassini Matthias, Battegay Manuel, Vernazza Pietro L, Bernasconi Enos, Ledergerber Bruno, Günthard Huldrych F, Swiss HIV Cohort Study (SHCS),
Project Swiss HIV Cohort Study (SHCS)
Show all

Original article (peer-reviewed)

Journal The Journal of infectious diseases
Volume (Issue) 210(10)
Page(s) 1555 - 61
Title of proceedings The Journal of infectious diseases
DOI 10.1093/infdis/jiu315

Open Access


High-risk sexual behaviors have been suggested as drivers of the recent dramatic increase of sexually transmitted hepatitis C virus (HCV) among human immunodeficiency virus (HIV)-infected men who have sex with men (MSM). We assessed the association between the genetic bottleneck of HIV at transmission and the prevalence and incidence of HCV coinfection in HIV-infected MSM from the Swiss HIV Cohort Study (SHCS). As a proxy for the width of the transmission bottleneck, we used the fraction of ambiguous nucleotides detected by genotypic resistance tests sampled during early HIV infection. We defined a broad bottleneck as a fraction of ambiguous nucleotides exceeding a previously established threshold (0.5%). From the SHCS, we identified 671 MSM with available results of HCV serologic tests and with an HIV genotypic resistance test performed during early HIV infection. Of those, 161 (24.0%) exhibited a broad HIV transmission bottleneck, 38 (5.7%) had at least 1 positive HCV test result, and 26 (3.9%) had an incident HCV infection. Individuals with broad HIV transmission bottlenecks exhibited a 2-fold higher odds of having ever experienced an HCV coinfection (odds ratio, 2.2 [95% confidence interval {CI}, 1.1-4.3]) and a 3-fold higher hazard of having an incident HCV infection (hazard ratio, 3.0 [95% CI, 1.4-6.6]) than individuals with narrow HIV transmission bottlenecks. Our results indicate that the currently occurring sexual spread of HCV is focused on MSM who are prone to exhibit broad HIV transmission bottlenecks. This is consistent with an important role of high-risk behavior and mucosal barrier impairment in the transmission of HCV among MSM.