- 16S rRNA sequences of Bartonella bacilliformis and cat scratch disease bacillus reveal phylogenetic relationships with the alpha-2 subgroup of the class Proteobacteria. O'Connor, S.P., Dorsch, M., Steigerwalt, A.G., Brenner, D.J., Stackebrandt, E. J. Clin. Microbiol. (1991)