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"Sputum" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings). Descriptors are arranged in a hierarchical structure, which enables searching at various levels of specificity.

MeSH information
Material coughed up from the lungs and expectorated via the mouth. It contains MUCUS, cellular debris, and microorganisms. It may also contain blood or pus.

This graph shows the total number of publications written about "Sputum" by people in the URMC Research Network by year, and whether "Sputum" was a major or minor topic of these publication.