图 4为孩子接种,保护了未接种的邻居证据等级:整群随机对照试验加拿大 49 个社区的整群随机对照试验:儿童接种流感疫苗的社区,未接种居民实验室确诊流感发病率为 3.1%(39/1271);儿童接种安慰剂的社区为 7.6%(80/1055)。未接种者保护效果 61%(95% CI 8%—83%,P=0.03)。总保护效果 59%(P=0.04)。来源:Loeb M, et al. JAMA 2010;303(10):943-950.
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