After the implementation of the EPI c old chain system,the incidence and mortality of the six infectious diseases have significantly reduced; the ave rage annual infection incidence is r educed form 624.99/100000to 5.31/100000,a fall of 99.16%.

• 自实施计划免疫冷链系统以来；六病发病率与死亡率都大幅下降；年均总发病率从实施前的624.；99/10万；降至实施后的5