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In 2000-2002, 53 strains of Influenza A viruses (H3N8, H4N2/6/8/9, H5N2/3, H9N2 and H13N6) were isolated from different species of birds and muskrats in natural biocenoses of Russia. The H5 strains possessed an HA cleavage site and connecting peptide (LRNVPQRETR/GL), similar to some avirulent strains, while the HA phylogenetic analysis revealed their relationship with some virulent strains circulated...
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