Abstract
The non-structural (NS) gene of highly pathogenic avian influenza viruses of the H5N1 subtype (HPAI-H5N1) isolated in Baltic Sea area of Sweden in 2006 was studied. The phylogenetic analysis data demonstrated that two distinct sub-lineages of HPAI-H5N1 were circulating during the outbreak in Northern Europe in Spring 2006. Sub-lineage I viruses fell into the same clade as viruses found in Denmark and Germany and formed a sub-clade which also included viruses isolated in the Russian Federation in late 2005. Sub-lineage II viruses formed a sub-clade closely related to European, Middle Eastern and African isolates reported in 2006. Analysis of the inferred amino acid sequences of the NS1 protein showed a deletion of five amino acids at positions 80–84. No viruses represented in this study contained Glu92 in the NS1 and all isolates contained the avian-like ESKV amino acid sequences at the NS1 C-terminal end. Sub-lineage I isolates contained unique substitutions V194I in NS1 and G63E in Nuclear export protein (NEP).



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Acknowledgements
We would like to thank Professor Berndt Klingeborn for helpful scientific discussions and constant support. Many thanks are due to Natasha Dahnberg for help with layout of the figures. Our appreciation also goes to Dr. Neil LeBlanc for critical review of the manuscript. The Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning (Formas), financially supported this work.
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Zohari, S., Gyarmati, P., Thorén, P. et al. Genetic characterization of the NS gene indicates co-circulation of two sub-lineages of highly pathogenic avian influenza virus of H5N1 subtype in Northern Europe in 2006. Virus Genes 36, 117–125 (2008). https://doi.org/10.1007/s11262-007-0188-7
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DOI: https://doi.org/10.1007/s11262-007-0188-7


