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Clustering of HCV coinfections on HIV phylogeny indicates domestic and sexual transmission of HCV.

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

Journal International journal of epidemiology
Volume (Issue) 43(3)
Page(s) 887 - 96
Title of proceedings International journal of epidemiology
DOI 10.1093/ije/dyt276

Open Access

URL https://doi.org/10.1093/ije/dyt276
Type of Open Access Publisher (Gold Open Access)

Abstract

HCV coinfection remains a major cause of morbidity and mortality among HIV-infected individuals and its incidence has increased dramatically in HIV-infected men who have sex with men(MSM). Hepatitis C virus (HCV) coinfection in the Swiss HIV Cohort Study(SHCS) was studied by combining clinical data with HIV-1 pol-sequences from the SHCS Drug Resistance Database(DRDB). We inferred maximum-likelihood phylogenetic trees, determined Swiss HIV-transmission pairs as monophyletic patient pairs, and then considered the distribution of HCV on those pairs. Among the 9748 patients in the SHCS-DRDB with known HCV status, 2768(28%) were HCV-positive. Focusing on subtype B(7644 patients), we identified 1555 potential HIV-1 transmission pairs. There, we found that, even after controlling for transmission group, calendar year, age and sex, the odds for an HCV coinfection were increased by an odds ratio (OR) of 3.2 [95% confidence interval (CI) 2.2, 4.7) if a patient clustered with another HCV-positive case. This strong association persisted if transmission groups of intravenous drug users (IDUs), MSMs and heterosexuals (HETs) were considered separately(in all cases OR>2). Finally we found that HCV incidence was increased by a hazard ratio of 2.1 (1.1, 3.8) for individuals paired with an HCV-positive partner. Patients whose HIV virus is closely related to the HIV virus of HIV/HCV-coinfected patients have a higher risk for carrying or acquiring HCV themselves. This indicates the occurrence of domestic and sexual HCV transmission and allows the identification of patients with a high HCV-infection risk.
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