Characteristics of aerobic gram-negative bacteria colonizing critically ill patients
| Autor: | S G Donaldson, A. R. Dal Nogare, S. Q. Azizi |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Pulmonary and Respiratory Medicine
Gram-negative bacteria Critical Care Fimbria Oropharynx Pilus Bacterial Adhesion Microbiology Humans Colonization Prospective Studies Cross Infection biology Gram-Negative Aerobic Bacteria Critically ill Stomach Rectum Water Bacterial Infections Pneumonia Middle Aged biology.organism_classification digestive system diseases Trachea Fimbriae Bacterial Water metabolism Bacterial outer membrane Bacteria |
| Zdroj: | The American review of respiratory disease. 144(1) |
| ISSN: | 0003-0805 |
| Popis: | Adherence of gram-negative bacteria (GNB) to epithelial surfaces is important for GNB colonization to occur. Pili, rodlike structures projecting from the outer membrane of GNB, and GNB surface hydrophobicity have been shown to enhance GNB adherence. We investigated the types of pili and the hydrophobicity of aerobic GNB colonizing the stomach, oropharynx, and trachea of critically ill patients. Piliation and hydrophobicity of oral, tracheal, and gastric GNB were compared with that of commensal GNB isolated from patients' rectums. Significantly more oropharyngeal than rectal GNB were piliated, and the most common type of pili present was type 1, or mannose-sensitive pili. Mannose-resistant and P pili were present less often, and no colonizing GNB had S pili. Colonizing GNB were hydrophilic rather than hydrophobic, and no differences in hydrophobicity were noted between colonizing GNB and rectal isolates. Our results suggest that pili may be important for oropharyngeal GNB colonization. |
| Databáze: | OpenAIRE |
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