Phylogenetic trees of 530 bp sequences of the groEL (A), 893 bp sequences of the msp2 (B) and 341 bp sequences of the msp4 genes (C). The phylogenetic trees include sequences obtained in this study from Anaplasma phagocytophilum from horses in Germany (this study: bold print) and selected A. phagocytophilum sequences available from GenBank. Bootstrap values >50% (1000 repeats) are presented at the respective nodes. GenBank accession numbers are indicated in parentheses, for sequences from this study the lettering used for the variants as found in Table 2 is indicated. The following gene sequences derived from GenBank [accession no.] were used in the construction of the phylogenetic trees. They are 100% identical in the analysed part to A. phagocytophilum GenBank sequences from the species indicated which were not included in the phylogenetic trees. Tree (A): [JF893915]: red deer - Slovenia; [GQ988765]: mouflon and chamois - Austria; [GQ988766]: Alpine ibex - Austria; [GQ988756]: cattle - Germany; [EU381150]: wild boar - Slovenia, horse - Sweden, Switzerland and Germany; [JF893925]: dog - Italy and Slovenia; [JF893919]: dog and roe deer - Slovenia; [DQ680012]: California wood rat, hispid cotton rat, gropher snake, and cottontail rabbit - USA; [AF548385]: cattle - Germany; Tree (C): [GU265829]: mouflon and chamois - Austria; [GU265831]: Alpine ibex - Austria; [AY706389]: cattle - France and Switzerland; [GU265832]: sheep; [HM028676]: roe deer - Spain; [JF893886]: sheep, goat - Switzerland.