No abstract available
MeSH terms
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Acute Disease
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Adenoviridae Infections / epidemiology*
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Adolescent
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Age Factors
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Antibodies / analysis
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Child
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Child, Preschool
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Czechoslovakia
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Female
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Humans
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Infant
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Infant, Newborn
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Male
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Mycoplasma Infections / epidemiology*
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Respiratory Syncytial Viruses*
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Respiratory Tract Infections / epidemiology*
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Respiratory Tract Infections / immunology
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Retrospective Studies
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Sex Factors