腹泻是一综合征,乃指排便次数增多、性状变稀或含有脓血。其病因较复杂,常由致病性微生物或寄生虫引起,如病毒、细菌及原虫等。由感染引起的腹泻称为感染性腹泻,而由其他药物、中毒、肠道器质性或功能性病变引起者为非感染性腹泻。感染性腹泻在我国及发展中国家的发病率仍较高,经济发达国家的旅游者去发展中国家旅游时易罹患腹泻,称旅游者腹泻,其病因多为常见致病菌。本文简介其病原学及发病机制。一、细菌性与原虫性腹泻有很多种肠道病原菌及阿米巴原虫可引起腹泻,其发病机理可分3种类 Diarrhea is a syndrome, refers to the increase in the number of bowel movements, thinning or contain sepsis. The etiology is more complicated, often caused by pathogenic microorganisms or parasites, such as viruses, bacteria and protozoa. Diarrhea caused by an infection is called infectious diarrhea and non-infectious diarrhea is caused by other drugs, poisoning, organic or intestinal pathological changes of the intestine. Infectious diarrhea incidence in China and developing countries is still high, tourists from economically developed countries travel to developing countries prone to diarrhea, said tourists diarrhea, the etiology and more common pathogens. This article describes its etiology and pathogenesis. First, bacterial and protozoal diarrhea There are many kinds of intestinal pathogens and amoeba can cause diarrhea, the pathogenesis can be divided into three types