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Updated: Jul 13, 2026

Detection of Low Copy Number Integrated Viral DNA Formed by In Vitro Hepatitis B Infection

Detection of Low Copy Number Integrated Viral DNA Formed by In Vitro Hepatitis B Infection

Published on: November 7, 2018

Hepatitis B virus genotypes in Europe.

Stephan Schaefer¹

¹Department of Virology, Institute for Medical Microbiology, Virology and Hygiene, Rostock University, Rostock, Germany.

Hepatology Research : the Official Journal of the Japan Society of Hepatology

|July 14, 2007

Summary

Hepatitis B virus (HBV) genotypes A and D show distinct geographic distributions in Europe. Genotype A responds better to interferon treatment, but lamivudine treatment shows more YMDD variants in genotype A.

Area of Science:

Hepatology
Virology
Epidemiology

Background:

Hepatitis B virus (HBV) exhibits eight genotypes, often with further subgenotype divisions.
HBV genotypes impact disease progression, treatment efficacy, and possess distinct geographic prevalence patterns.
In Europe, genotypes A and D are predominant, with genotype A more common in the north and genotype D in Mediterranean and Eastern European regions.

Purpose of the Study:

To summarize current knowledge on HBV genotypes and subgenotypes in European countries with low to intermediate HBV endemicity.
To review the geographic distribution of HBV genotypes and subgenotypes in Europe.
To analyze the influence of HBV genotypes on treatment outcomes, specifically with interferon and lamivudine.

Main Methods:

Literature review of existing studies on HBV genotypes in Europe.

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Analysis of geographic prevalence data for HBV genotypes A and D and their subgenotypes.

Comparison of treatment responses (virological response, anti-HBs development, YMDD variant emergence) based on HBV genotype.

Main Results:

Genotype A is prevalent in Northern Europe, while genotype D is found in Southern and Eastern Europe.
Subgenotype A2 is the most common subgenotype across Europe.
Genotype A demonstrates superior virological response to interferon therapy compared to genotype D, with higher rates of anti-HBs development.
Lamivudine treatment in the first year shows increased YMDD variant emergence in genotype A compared to genotype D.

Conclusions:

HBV genotypes A and D exhibit clear geographic segregation in Europe.
Genotype A offers a better virological response to interferon but presents a higher risk of YMDD variant emergence with lamivudine.
Further research is needed to clarify the geographic prevalence of genotype D subgenotypes.