1) Eubacteria 2) Eubacterium 3) True bacteria 
Obligate intracellular parasites which cause a variety of disease, including typhus and Rocky Mountain spotted fever. ... (09 Oct 1997) ... 
[n] - rod-shaped microorganisms resembling both bacteria and viruses
bacteria belonging to the genus Rickettsia. Species of Rickettsia are carried as parasites by many ticks, fleas, and lice, causing diseases such as typhus.