这个词是什么意思？
A genus of gram-negative, facultatively anaerobic, rod-shaped bacteria whose organisms occur in the lower part of the intestine of warm-blooded animals. The species are either nonpathogenic or opportunistic pathogens.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D004925 · MeSH 2026。
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