So 9% less cardiovascular disease, 13% less Parkinson's and Alzheimer's, 6% less cancer, 9% less mortality from all causes.

心血管类疾病患病率降低9%,帕金森病和老年痴呆症降低13%,癌症降低6%,由各种原因导致的死亡率降低9%

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

So, this just shows as the vaccine was distributed, given to more people, that prevalence of the disease dropped dramatically.

因此,这表明随着疫苗的推广,以及接种人数的增加,该疾病的患病率显著降低

耶鲁公开课 - 生物医学工程探索课程节选

It dropped dramatically in the period from 1954-- this is these filled black bars refer to this axis, polio cases per 100,000 population dropped down to only three or four cases by 1956.

患病率在一九五四年后的,一段时间里急剧下降,该坐标轴上的这些黑色柱形图表明,到一九五六年,小儿麻痹症的发病率,已经降低至每十万人中仅三到四人发病

耶鲁公开课 - 生物医学工程探索课程节选