Phylogenetic analysis of
) based on 16S rRNA gene partial sequences. A neighbor joining tree was constructed using the Kimura two-parameter model in Mega 4.0. An alignment of 16S rRNA sequences from position 694 to 1334 of the sequence (based on strain ES34, GenBank accession no. AB196720) was used to construct this tree. Rickettsia rickettsii is used as an outgroup.