[Haemophilic bacteria of the nasopharynx of healthy persons].

The study of the species composition of hemophilic bacteria inhabiting the nasopharynx of healthy persons has revealed that H. parainfluenzae is the predominant species (82.0 +/- 4.8%) among these bacteria. The isolation of H. influenzae and H. parahaemolyticus has been found to occur considerably more rarely and in lesser numbers (9.0 +/- 1.5% and 3.8 +/- 1.0%, respectively). These data indicate that H. parainfluenzae should be regarded as the ecological dominant in the nasopharyngeal biocenosis, while H. influenzae and H. parahaemolyticus appear to be transitory microorganisms. Among the studied biochemical properties of hemophilic bacteria, the following properties have proved to be most stable: the reduction of nitrates, the splitting of glucose, sucrose, maltose, galactose, fructose and negative reactions as regards the formation of hydrogen sulfide, oxidase, the splitting of mannitol, sorbitol, lactose, xylose, arabinose.