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  • infant
  • Children at special risk (e.g., sickle cell disease and asplenia) require as full protection as can be achieved using the 7-valent conjugated vaccine, with the more extensive 23-valent vaccine given after the second year of life: In 2001, the Centers for Disease Control (CDC), upon advice from its Advisory Committee on Immunization Practices, recommended the vaccine be administered to every infant and young child in the US. (wikipedia.org)