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全国免疫调查(National Immunization Survey,NIS)估算了50个州和抽样的地区,19～35月龄儿童的免疫覆盖率[2008年NIS17个地区样本,包括6个接受联邦政府捐赠资金,并且自1994年NIS成立以来一直参加NIS调查的地区(哥伦比亚、伊利诺伊州芝加哥、纽约、宾夕法尼亚州费
The National Immunization Survey (NIS) estimates immunization coverage of children aged 19-35 months in 50 states and sampled areas [NIS17 sample of 2008, including 6 receiving federal government donations, and since 1994 The area that has been participating in NIS surveys since the establishment of NIS (Columbia, Illinois, Chicago, New York, Pennsylvania fees