No abstract available
MeSH terms
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Aged
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Aging / immunology*
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Anti-Bacterial Agents / therapeutic use
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Bacterial Infections / drug therapy
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Bacterial Infections / immunology*
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Humans
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Respiratory Tract Infections / drug therapy
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Respiratory Tract Infections / epidemiology
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Respiratory Tract Infections / immunology*
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Respiratory Tract Infections / microbiology
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Risk Factors