Some microorganisms, such as the germs that trigger syphilis, can not be cultured whatsoever. Other bacteria, such as those that create consumption, can be cultured yet take weeks to expand. Some examples sent out for screening, such as spit, stool, and mucous from the nose or throat, generally consist of many sorts of germs that do not cause illness. Physicians require to distinguish between these microorganisms as well as those that could create the person's ailment. look at this website