这个词是什么意思？
A sequence of infection transmission from infectious agent leaving DISEASE RESERVOIR or host through a portal of exit, conveyed by some mode of transmission, and entering through a portal of entry to infect a susceptible host.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D000086003 · MeSH 2026。
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