Web Reference: R0级切除（R0 resection）是肿瘤外科手术中的一个重要概念，指的是**手术切缘经病理学检查确认无癌细胞残留**，即**肿瘤被完整、彻底地切除**。 ### R0切除的核心要点： - **切缘阴性**：手术切除标本的边缘（包括周围组织）在显微镜下未发现癌细胞。 - **完整切除**：不仅切除了可见的肿瘤主体，还 ... 基本传染数 (R0) 在流行病学中有一个叫做基本传染数R0的数字。 简单来说，是一个衡量病毒传播的参数——没有外界干扰而且以前完全没见过这个病（即无免疫力），一个人平均会感染几个人。 那么，数字越大传播能力就越强。 ... May 8, 2020 · Governments around the world are monitoring it to see whether it's safe to lift lockdown. But what is the R number, and why does it matter?
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