Which of the following bacteria are fastidious, pleomorphic, gram-negative bacilli, are obligate intracellular parasites that survive only briefly outside of a host (reservoir or vector), and can multiply only intracellularly?

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Rickettsiae are fastidious bacteria that are obligate intracellular parasites. These bacterial agents survive only briefly outside of a host (reservoir or vector) and multiply only intracellularly. Organisms are small (0.3 μm × 1.0 to 2.0 μm), pleomorphic, gram-negative bacilli that multiply by binary fission in the cytoplasm of host cells; the release of mature rickettsiae results in the lysis of the host cell.

Which of the Following Bacteria Are Fastidious, Pleomorphic, Gram-Negative Bacilli