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ARTICLE |

Pharyngeal Colonization by Gram-Negative Bacilli in Aspiration-Prone Persons

Philip A. Mackowiak, MD; Ralph M. Martin, BS; Stephen R. Jones, MD; James W. Smith, MD
Arch Intern Med. 1978;138(8):1224-1227. doi:10.1001/archinte.1978.03630330024009.
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We compared the prevalence of Gram-negative bacilli in the pharyngeal flora of two groups of patients with a known predilection for Gram-negative bacillary pneumonia (chronic alcoholics and diabetics), two other groups of aspiration-prone persons with no known predilection for Gram-negative bacillary pneumonia (epileptics and narcotic addicts), and normal control subjects. Quantitative cultures of saline gargles showed pharyngeal Gram-negative bacilli to be significantly (P <.05) more prevalent among alcoholics (35%) and diabetics (36%) but not epileptics (17%) or addicts (20%) than controls (18%). Counts of 100 Gram-negative bacilli per milliliter were also significantly more common in alcoholics (14%) and diabetics (24%) than controls (5%, P <.05). Enterobacter sp, Klebsiella pneumoniae, and Escherichia coli were the most common Gram-negative bacilli isolated. Increased colonization by Gram-negative bacilli might be a factor contributing to the propensity of alcoholics and diabetics for Gram-negative pneumonia.

(Arch Intern Med 138:1224-1227, 1978)

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