傳染正常人體中如口腔、腸腔,皮膚等处,都有細菌寄生,這在上期“正常人體細菌“一文中已經講過,但是那些細菌在正常情况下都是不致病的,若是病原菌侵入人體,就名為傳染。傳染分兩种:一种病原菌傳染的名簡單傳染;兩种以上病原菌傳染名為複雜傳染。複雜傳染或是几种病原菌互相加强傳染性,或是一种病原菌為他种病原菌打 Infectious normal human body, such as the mouth, intestine, skin and other places, have bacterial parasites, which in the last issue of “normal human bacteria” has been talked about, but those bacteria are not pathogenic in normal circumstances, if the pathogen invade The human body, called the infection. Infections are divided into two kinds: a simple infection of a pathogen infection; two or more infections of a pathogen called a complex infection. Complex infection or several pathogens to enhance mutual infectivity, or a pathogen for his pathogenic bacteria hit