The main reason that the spores of disease-causing bacteria are dangerous is that they

The main reason that the spores of disease-causing bacteria are dangerous is that they are very difficult to destroy. If the bacteria is not suited in the condition state of the environmental, other kinds transform to an inactive state. They advance with a hard outer covering and look out for the suitable environmental conditions. This lie dormant bacterium is known as spores. Spores are more difficult to destroy than those bacteria that are active for they have a harder outer covering.