No abstract available
MeSH terms
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Central America / epidemiology
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Child, Preschool
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Humans
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Infant
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Multicenter Studies as Topic
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Pan American Health Organization
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Pneumococcal Infections / epidemiology*
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Pneumococcal Infections / microbiology
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Population Surveillance*
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South America / epidemiology
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Streptococcus pneumoniae / classification*
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Streptococcus pneumoniae / isolation & purification