FIG. 1.

Radial dendrogram of aligned msp2 amplicon sequences from the Webster strain of A. phagocytophila. The tree was constructed from an alignment of 124 sequences by using the neighbor-joining algorithm and was simplified to show only representative members of the 18 unique clades. The names of the sequences were assigned arbitrarily; the prefix RWMSP indicates sequences derived solely from cDNA amplicons. Scale bar = 0.1 nucleotide substitution per site.