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We propose the name Rickettsia massiliae sp. nov. (type strain, Mtu1 in the Collection of the World Health Organization Collaborative Center for Rickettsial Reference, Marseille, France) for a spotted fever group rickettsia determined to be distinct from previously recognized species by the serotyping method (L. Beati, J.-P. Finidori, B. Gilot, and D. Raoult, J. Clin. Microbiol. 30:1922-1930, 1992). This rickettsia has biological characteristics similar to those of the other spotted fever group rickettsiae. In addition, a sodium dodecyl sulfate-polyacrylamide gel electrophoresis protein analysis, a polymerase chain reaction followed by a restriction fragment length polymorphism analysis of DNA fragments, and pulsed-field electrophoresis of the genome of R. massiliae revealed unique migration patterns distinct from those of all previously recognized spotted fever group rickettsiae. These additional characteristics (Beati et al., J. Clin. Microbiol. 30:1922-1930, 1992), together with the data usually considered sufficient for description of rickettsiae, are crucial to the proposal of this new species and should be helpful in species identification.

NOTES: Rickettsia massiliae sp. nov., a New Spotted Fever Group Rickettsia