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Wikipedia

Rickettsia:

"Rickettsia" is a genus of non-motile, Gram-negative, non-sporeforming, highly pleomorphic bacteria that can present as cocci (0.1 μm in diameter), rods (1–4 μm long) or thread-like (10 μm long). Being obligate intracellular parasites, the "Rickettsia" survival depends on entry, growth, and replication within the cytoplasm of eukaryotic host cells (typically endothelial cells).

立克次体:

立克次体（"Rickettsia"），或者称立克次氏体是一类细菌，但许多特征和病毒一样，如不能在培养基上培养，可以通过瓷濾器过滤，只能在动物细胞内寄生繁殖等。