疫苗组感染率: 11/185=0.05946
对照组感染率: 174/185=0.94054
保护率=(0.94054-0.05946)/0.94054=93.68%
疫苗组感染率: 11/185=0.05946
对照组感染率: 174/185=0.94054
保护率=(0.94054-0.05946)/0.94054=93.68%
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