Fig. 1
From: Phylogenomic assessment of 23 equid alphaherpesvirus 1 isolates obtained from USA-based equids
Phylogenomic tree (viewed with Splitstree (ver. 4.16.1) [29]) showing 137 EHV-1 isolates including the 23 EHV-1 isolates sequenced for the present study, with an EHV-8 outgroup (shown in pink, Genbank accession NC017826). Diagram created using an alignment subsequently modeled using ModelFinder [27] in Iqtree (ver. 1.6.12) [28]. The letters A to G are used to indicate the position of large groups of isolates at a single point on the diagram. European, USA, Australian and Asian isolates are shown in red, blue, purple and green respectively. Evidence of isolate grouping by regional origin (Europe, USA, Australia or Asia) is evident, as is grouping of isolates which were obtained from individual outbreaks (e.g. clade D)