WHO's work in this area includes setting standards, strengthening immunization system, regulating vaccine quality and supply, finance, and research and development.

世卫组织在该领域的工作包括制定标准、加强免疫系统、管理疫苗质量和供应、资助以及研究与开发。

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For example, you can proceed to develop a vaccine, but you do not simultaneously need to decide whether to proceed with immunization, what its scope will be and who priority recipients will be.

例如，可能着手研制疫苗，但并不需要同时决定是否进行接种，接种范围有多大以及优先考虑哪些接种者。

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WHO's work in this area includes standard-setting; research and development; vaccine regulation, quality and safety; vaccine supply; immunization financing; and immunization system strengthening.

世卫组织在该领域的工作包括制定标准、研究开发、疫苗监管、质量和安全性、疫苗供应、免疫资助及免疫系统加强。

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An updated 2013 immunization schedule for children and adolescents also recommends pregnant adolescents receive the Tdap vaccine.

WSJ: Panel Pushes Vaccine for Pregnant Women

"It was debated by the CDC Advisory Committee on Immunization Practices for many years, and the indication for the use of influenza vaccine for an increasing number of groups on a piecemeal basis didn't make sense, " Schaffner said.

CNN: Flu vaccine attitudes abroad differ from U.S.