Under conditions of nutritional depletion, some gram-positive bacteria can convert from a vegetative state to a dormant state, and form a single internal spore, endospore. The spore looks bright, often ovoid in the microscope.

• 在营养缺乏情况下,某些革兰阳性菌可由繁殖状态转变成休眠状态,在菌体内部形成一个芽胞,即内芽胞,简称芽胞。在显微镜下呈光亮的椭圆形小体。