这个词是什么意思？
A group of pathogens comprising the smallest known agents of infectious disease. They are unencapsulated and are capable of replicating autonomously in susceptible cells. Positively identified viroids composed of single-stranded RNA have been isolated from higher plants, but the existence of DNA viroids pathogenic to animals is suspected.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D014772 · MeSH 2026。
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