R
- Rhizobium radiobacter
- Rickettsia
- Rickettsia prowazekii
- Rickettsia psittaci
- Rickettsia quintana
- Rickettsia rickettsii
- Rickettsia trachomae
- Rochalimaea
- Rochalimaea henselae
- Rochalimaea quintana
- Rothia dentocariosa
Read more about this topic: List Of Clinically Important Bacteria