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当前学科：流行病学
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脊髓灰质炎活疫苗现场试验结果表明：接种疫苗组儿童脊髓灰质炎的发病率是16/10万，接受安慰剂组儿童的发病率是57／10万，因此该疫苗的效果指数是（）
A . 72%
B . 0.28
C . 72
D . 3.6
E . 41
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