近年来,在不受重视的细菌中不断发现新的致病菌如军团菌、弯曲菌、螺秆菌、双脊菌等,新发现的致病病毒更是层出不穷,目前已发展有20个科病毒与人类疾病有关,人免疫缺陷病毒(HIV)就是其中之一。原认为不致病寄居于人体内的菌属已分化出许多致病菌,如大肠秆菌中不少菌种皆可引起肠炎而导致腹泻。许多机会性致病菌由于机体免疫 In recent years, new pathogens such as Legionella, Campylobacter, Myceliophthora, Diphtheriae, etc. have been found continuously in bacteria that are not valued, and newly emerged pathogenic viruses are emerging in an endless stream. At present, 20 families Viruses are linked to human diseases, and human immunodeficiency virus (HIV) is one of them. The original thought that does not cause disease in the human body bacteria have differentiated a number of pathogenic bacteria, such as coliform bacteria in many species can cause enteritis and cause diarrhea. Many opportunistic pathogens are immune to the body