Figure 5. Phylogenetic relationships among detected EHV viruses.

(A) Phylogenetic maximum likelihood tree generated from nucleotide sequences of a 600 bp fragment of the herpesvirus DPOL gene, using Asinine Herpesvirus 5 (AHV-5, accession no. FJ798319.1) as an out-group. Each tip represents one sample with the host individual’s initial letter and sampling day indicated. Two genotype variants in the clusters Fr and Ki had been identified in “Franzi” and “Kianga”, respectively, in a previous study, with the respective reference sequences labeled “F ref”, and “K ref”, respectively. Clusters “Fr”, “Ki”, and “Ek” are indicated by different frame lines. Colored tips indicate potential transmission events. (B) Genotypes as in Fig. 3. A indicated by frame lines, traced per individual during the two weeks after arrival of the new mare.