这个词是什么意思？
A species of gram-negative, aerobic bacteria that is the etiologic agent of ROCKY MOUNTAIN SPOTTED FEVER. Its cells are slightly smaller and more uniform in size than those of RICKETTSIA PROWAZEKII.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D012284 · MeSH 2026。
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