Even one such event is statistically unlikely outside of rapidly reproducing bacterial colonies. 即使是繁殖快速的细菌菌落，在统计上也不可能发生这样的事件。
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. 图示的是感染性心内膜炎时心瓣膜，左侧下方蓝染区域为细菌菌落伸展到心脏瓣膜的粉红色基底膜处。
