| Rickettsia | any of a group of parasitic bacteria that live in arthropods (as ticks and mites) and can cause disease if transmitted to human beings |
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| Rickettsia | microorganism resembling bacteria inhabiting arthropod tissues but capable of causing disease in vertebrates |
| Rickettsia | relating to or caused by rickettsias |
| Rickettsia | infectious disease caused by ticks or mites or body lice infected with rickettsial bacteria |
| Rickettsia | pleomorphic gram-negative microorganisms |
| Rickettsia | rod-shaped microorganisms resembling both bacteria and viruses |