A. Epidemic typhus - Rickettsia prowazekii, carried by human body louse. Pathogen grows in GI tract of the louse and is excreted. Very high mortality rates if untreated. Treat with tetracycline and chloramphinicol B. Endemic murine typhus. Rickettsiae typhi .
Common hosts are rats and mice.
Transmitted by the rat flea. Particularly prevalent in Texas. Tick borne typhus. Rocky Mtn spotted Fever - but it is really most common in the east. Transmitted by ticks which are infected transovarially.