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病菌、病毒或寄生虫等病原体侵入人体内,生长繁殖,产生毒素,使组织破坏,机能丧失;同时又由该病人传染给其他健康的人,使之患同样的病症,这种病症就叫传染病。传染病有急性与慢性两种,在学校里常见的急性传染病有:麻疹、百日咳、猩红热、白喉、水痘、风疹、脊髓前角灰白质炎、流行性腮腺炎、流行性感冒、赤痢、伤寒等病。漫性传染病有结核、砂眼、疥癣及肠内寄生虫等。
Pathogens such as germs, viruses or parasites invade the human body, grow and multiply, produce toxins, so that tissue damage, loss of function; at the same time by the patient infected with other healthy people suffering from the same disease, the disease is called infection disease. Acute and chronic infectious diseases are two kinds of acute infectious diseases common in schools are: measles, whooping cough, scarlet fever, diphtheria, chicken pox, rubella, anterior horn horn disease, mumps, influenza, dysentery, typhoid fever Other diseases. Diffuse infectious diseases are tuberculosis, trachoma, mange and intestinal parasites.