No abstract available
MeSH terms
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Bacteria / isolation & purification*
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Bacteriological Techniques*
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Bronchitis / microbiology*
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Chronic Disease
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Haemophilus influenzae / isolation & purification
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Humans
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Neisseria / isolation & purification
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Sputum / microbiology*
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Streptococcus pneumoniae / isolation & purification