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EIV/Jilin/89 is marked in the phylogeny with a red circle, AIVs isolated in Mongolia (AIVs/2009-11) are indicated with blue and green circles (the latter represent the isolates used in HA assays) and the currently circulating H3N8 EIV lineage (“Classical EIV”) is indicated with a red box. The scale bar represents the number of substitutions per site. Bootstrap values are indicated next to the relevant nodes.
