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二、疾病发生的原因疾病是机体与环境(包括内环境)对立统一的破坏。而导致这种关系破坏的因素有二:一是外界环境致病因素(外因);一是机体内在致病因素(内因)。外界环境的致病因素包括了自然因素与社会因素两个方面:自然因素有:(1)生物因素,即病原微生物或病原体。如各种病原微生物(细菌、病毒、支原体、立克次体、螺旋体、真菌、衣原体等)和寄生虫(如原虫,蠕虫等),这些因素的致病作用与其致病力,数量及其侵入机体的部位是否适宜有密切的关系。而它们侵入体内,在一定的部位生长繁殖,一方面造成了机械性损伤,另一
Second, the causes of disease The disease is the body and the environment (including the internal environment) against the unity of destruction. The factors that lead to the destruction of this relationship are twofold: First, the external environment pathogenic factors (external factors); First, the body of the risk factors (internal). Pathogenic factors of the external environment, including natural and social factors in two aspects: natural factors are: (1) biological factors, namely pathogenic microorganisms or pathogens. Such as various pathogenic microorganisms (bacteria, viruses, mycoplasma, rickettsia, spirochetes, fungi, chlamydia, etc.) and parasites (such as protozoa, worms, etc.), the pathogenic role of these factors and their virulence, Body parts are suitable for a close relationship. And they invade the body, in a certain part of the growth and reproduction, on the one hand caused by mechanical damage, the other