NCIt definition : A species of aerobic, Gram negative, rod and cocci shaped bacteria assigned to the
phylum Proteobacteria. This species is obligately intracellular, motile and transmitted
to humans by a tick or flea host. R. typhi is a pathogen that causes murine typhus.;
Alternative definition : CDISC: Any bacterial organism that can be assigned to the species Rickettsia typhi.;