预防接种即有针对性地将生物制品接种到人体内,使之产生免疫力,以达到预防传染病的目的。如服小儿麻痹(脊髓灰质炎)活疫苗糖丸能预防脊髓灰质炎;接种卡介苗能预防结核病等。因此,预防接种是提高人群免疫水平,预防,控制和消灭传染病的重要措施之一。 Vaccination is targeted to biological products inoculated into the body, so that the immune system, in order to achieve the purpose of preventing infectious diseases. As polio (poliomyelitis) live vaccine pills can prevent poliomyelitis; BCG vaccination can prevent tuberculosis and so on. Therefore, vaccination is one of the important measures to improve the level of population immunity and prevent, control and eliminate infectious diseases.