To clarify these points: Pathogenicity is defined as the ability of an infectious agent to cause disease or damage in a host.

病义是一种传染病原体在宿主体内引起疾病损害能力。

Particular chunks of its genome, called " pathogenicity islands" (or Sapis), seem to behave like genetic parasites; bits of DNA that replicate selfishly without regard for the well-being of their host.

其基因组特部分，称为“病”(病)，似乎表现得像是遗传寄生物; 这些DNA片段会自私地复制，不顾宿主健康。