No abstract available
MeSH terms
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Child, Preschool
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England / epidemiology
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Haemophilus Infections / epidemiology
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Haemophilus Infections / immunology
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Haemophilus Infections / prevention & control*
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Haemophilus Vaccines / administration & dosage*
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Haemophilus influenzae type b / immunology*
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Humans
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Immunologic Memory
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Infant
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Wales / epidemiology