Microscopically, the valve in infective endocarditis demonstrates friable vegetations of fibrin and platelets (pink) mixed with inflammatory cells and bacterial colonies (blue).

显微镜下可见感染性心内膜炎瓣膜覆盖松脆的赘生物，其中有纤维蛋白和血小板（淡红色），并夹杂着炎性细胞和菌落（蓝色）。

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The small pink vegetation on the rightmost cusp margin represents the typical finding with non-bacterial thrombotic endocarditis (or so-called "marantic endocarditis"). This is non-infective.

在最右方尖端边缘的小而淡红的赘生物是非细菌性血栓性心内膜炎(或称为“消耗性心内膜炎”)的典型表现；本病不是由感染引起的。

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Here is a valve with infective endocarditis. The blue bacterial colonies on the lower left are extending into the pink connective tissue of the valve.

感染性心内膜炎瓣膜，左下方的蓝色菌落正向瓣膜的淡红色结缔组织蔓延。

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Here is a valve with infective endocarditis. The blue bacterial colonies on the lower left are extending into the pink connective tissue of the valve.

感染性心内膜炎瓣膜，左下方的蓝色菌落正向瓣膜的淡红色结缔组织蔓延。

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