Molecular epidemiology of hepatitis B virus infection in Switzerland: a retrospective cohort study

BMC Infectious Diseases

Samuel Zürcher³  Nasser Semmo¹  Jean-Francois Dufour¹  Meri Gorgievski-Hrisoho³  Marta Owczarek³  Gilles Wandeler²  Cédric Hirzel² 

[1] Hepatology Unit, Department of Visceral Surgery and Medicine University Hospital Bern, Bern, Switzerland;Department of Infectious Diseases, Bern University Hospital and University of Bern, Bern, Switzerland;Institute for Infectious Diseases, University of Bern, Bern, Switzerland

关键词: Switzerland;    Phylogenetic analysis;    Genotype;    Hepatitis D virus;    Hepatitis B virus;   

Others  :  1232653
DOI  :  10.1186/s12879-015-1234-z

 received in 2015-03-13, accepted in 2015-10-19,  发布年份 2015

【 摘 要 】

Background

Chronic hepatitis B virus (HBV) infection affects up to 7 % of the European population. Specific HBV genotypes are associated with rapid progression to end-stage liver disease and sub-optimal interferon treatment responses. Although the geographic distribution of HBV genotypes differs between regions, it has not been studied in Switzerland, which lies at the crossroads of Europe.

Methods

In a retrospective analysis of 465 HBV samples collected between 2002 and 2013, we evaluated the HBV genotype distribution and phylogenetic determinants, as well as the prevalence of serological evidence of hepatitis delta, hepatitis C and HIV infections in Switzerland. Baseline characteristics of patients were compared across their region of origin using Fisher’s exact test and ANOVA, and risk factors for HBeAg positivity were assessed using logistic regression.

Results

The Swiss native population represented 15.7 % of HBV-infected patients living in Switzerland. In the overall population, genotype D was most prevalent (58.3 %), whereas genotype A (58.9 %) was the predominant genotype among the Swiss native population. The prevalence of patients with anti-HDV antibodies was 4.4 %. Patients of Swiss origin were most likely to be HBeAg-positive (38.1 %). HBV genotypes of patients living in Switzerland but sharing the same original region of origin were consistent with their place of birth.

Conclusions

The molecular epidemiology of HBV infection in Switzerland is driven by migration patterns and not by the genotype distribution of the native population. The prevalence of positive anti-HDV antibodies in our cohort was very low.

【 授权许可】

   
2015 Hirzel et al.

【 图 表 】

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