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1997年1月，美国免疫实施咨询委员会（ACIP）推荐采用一个灭活脊髓灰质炎（脊灰）疫苗（IPV）-口服脊灰疫苗（OPV）连续接种程序。当人群存在输人野毒株的潜在可能时，这种在2月龄和4月龄接种2剂IPV，接着在12-18月龄和4-6岁接种二剂OPV的免疫程序，可以最大程度地降低脊灰疫苗
In January 1997, the Advisory Committee on Immunization Implementation (ACIP) recommended an inactivated poliomyelitis (poliomyelitis) vaccine (IPV) - oral polio vaccine (OPV) continuous vaccination program. This population of 2-dose IPV vaccination at 2 and 4 months of age followed by two-dose of OPV at 12-18 months and 4-6 years of age may be maximized when there is a potential population-of-human transmission of wild-type strains To a degree to reduce polio vaccine