Of the following organisms, which can be described as a fastidious obligate intracellular parasite that multiplies by binary fission in the cytoplasm of host cells and infects humans as accidental hosts in most cases?
a. Rickettsia
b. Chlamydia
c. Calymmatobacterium
d. Coxiella
A
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. The organisms are small (0.3 m 1.0 to 2.0 m), pleomorphic, gram-negative bacilli that multiply by binary fission in the cytoplasm of the host cells. The release of mature Rickettsiae results in the lysis of the host cell.
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