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Incident Hepatitis C Virus Genotype Distribution and Multiple Infection in Australian Prisons.

ABSTRACT: Hepatitis C virus (HCV) is a highly diverse pathogen that is classified into seven distinct genotypes. Simultaneous or sequential reinfection with multiple HCV genotypes is recognized in high-risk populations, such as injecting drug users (IDUs). Multiple infection is of clinical concern as different genotypes have various sensitivities to current antiviral therapies. Therefore, a better understanding of the frequency of multiple infection and of the genotypes currently being transmitted is clinically relevant. An Australian cohort of IDUs (n = 123), identified with primary incident infection, was followed for multiple infection by regular HCV RNA testing between 2005 and 2013. A total of 354 samples were tested. Sequencing of primary incident infections revealed that genotype 3a was the most common circulating genotype, followed by genotype 1a. Examination of longitudinally collected samples identified complex patterns of multiple infection, including reinfection and superinfection. In those with multiple infection, there was no apparent evidence of homotypic immunity conferring protection against reinfection of the same subtype. This study revealed frequent multiple infection in a high-risk prisoner cohort, illustrating the complex nature of HCV infection and reinfection and highlighting the need for pan-genotypic antiviral therapies.

SUBMITTER: Walker MR

PROVIDER: S-EPMC4922113 | biostudies-literature | 2016 Jul

REPOSITORIES: biostudies-literature

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Incident Hepatitis C Virus Genotype Distribution and Multiple Infection in Australian Prisons.

Walker Melanie R MR Li Hui H Teutsch Suzy S Betz-Stablein Brigid B Luciani Fabio F Lloyd Andrew R AR Bull Rowena A RA

Journal of clinical microbiology 20160511 7

Hepatitis C virus (HCV) is a highly diverse pathogen that is classified into seven distinct genotypes. Simultaneous or sequential reinfection with multiple HCV genotypes is recognized in high-risk populations, such as injecting drug users (IDUs). Multiple infection is of clinical concern as different genotypes have various sensitivities to current antiviral therapies. Therefore, a better understanding of the frequency of multiple infection and of the genotypes currently being transmitted is clin ...[more]

PMID: 27170021

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Project description:ObjectiveThis study was conducted to determine the prevalence and genotype distribution of hepatitis C virus (HCV) infection among patients with type 2 diabetes mellitus (DM).Subjects and methodsWe included 556 consecutive patients with confirmed type 2 DM attending the Diabetic Clinic of the Bushehr University of Medical Sciences and 733 nondiabetic subjects as controls. Serum levels of fasting blood sugar (FBS), alanine transaminase (ALT), aspartate transaminase (AST), total cholesterol (TCH), and triglycerides (TG) were measured by enzymatic colorimetric methods, and the presence of anti-HCV antibodies was determined by enzyme-linked immunosorbent assay. Semi-nested reverse transcriptase-polymerase chain reaction (RT-PCR) followed by sequencing was performed on all anti-HCV-seropositive samples. Data were analyzed using the Statistical Package for the Social Sciences 17, and descriptive statistics, χ2 test, Fisher exact test, and the Student t test were used for analysis.ResultsThe seroprevalence of HCV in the diabetic patients was 1.98% (11/556), which was higher than HCV prevalence among the nondiabetic controls (4/733, 0.54%) (p = 0.032). No significant differences in ALT, AST, FBS, TG, and TCH levels were found between the HCV-seropositive and HCV-seronegative diabetic patients, although HCV-seropositive diabetic patients tended to have higher ALT, AST, and TCH levels, but lower TG and FBS levels than HCV-seronegative patients. In logistic regression analysis, only AST levels were significantly associated with HCV seropositivity among diabetic patients. The AST level of 41-80 IU/L was the only significant predictive variable for HCV seropositivity in the diabetic patients (odds ratio, 4.89; 95% CI: 1.06-22.49; p = 0.041). Of the 11 HCV-seropositive diabetic patients, 10 (91%) had HCV viremia with genotype 3a.ConclusionPatients with type 2 DM had a higher prevalence of HCV infection than controls, and HCV seropositivity was independent of biochemical parameters.

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Incident Hepatitis C Virus Genotype Distribution and Multiple Infection in Australian Prisons.

Publications

Incident Hepatitis C Virus Genotype Distribution and Multiple Infection in Australian Prisons.

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