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. 1996 Nov;34(11):2713–2717. doi: 10.1128/jcm.34.11.2713-2717.1996

Introduction of a new hepatitis agent in retrospect: genetic studies of Swedish hepatitis D virus strains.

Y Y Zhang 1, B G Hansson 1
PMCID: PMC229391  PMID: 8897170

Abstract

The supposedly first outbreak of hepatitis D virus (HDV) infection in Sweden occurred among intravenous drug addicts in the Malmö area in the mid-1970s. Stored sera from this outbreak were used for viral RNA extraction and analysis. By sequence comparisons, the HDV genomes from those Swedish patients fell into two separate clusters, within which the RNA sequences were closely related. These two HDV groups genetically resembled the French and US-1 isolates of genotype I, respectively, indicating that there had been at least two separate sources of HDV infection. The genetic alterations of the HDV RNA were investigated by sequence analysis of nine annually drawn serum samples from one patient and paired samples collected between 2 and more than 10 years apart from six patients with chronic HDV infection. Only mutational changes were observed, and no insertion or deletion appeared throughout the periods observed. It was found that the Swedish HDV isolates mutationally evolved at an average rate of 1.1 x 10(-3) substitutions per nucleotide per year over a long time course of chronic HDV infection, which is of the same magnitude as that of other RNA viruses.

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Selected References

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