喉頭における細菌叢の動態

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  • CHANGES OF LARYNGEAL BACTERIAL NORMAL FLORA

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There are several so-called organ defense systems in the upper respiratory tract, where microbes can enter from the outside. Recently, the role of the normal flora of the upper respiratory tract in fighting infection has attracted attention. In the present paper, we studied normal bacterial flora of the larynx, the posterior pharyngeal wall, the palatine tonsil and the nasal cavity of patients who were free from otolaryngological diseases ranging in age from newborn to 84 years. We examined the acquisition and changes in normal bacterial flora at those sites. We also studied the detection of bacteria during acute and chronic laryngitis. We found that the normal flora of α-Streptococcus, Lactococcus, and Micrococcus started to develop 6 hours after birth in the neonatal larynx, and was detected 24 hours after birth in all cases. We did not isolated any anaerobes from the neonatal larynx until 5 days after birth. The detected ratios of gram-positive bacteria and gram-negative bacteria decreased with aging. The detected ratio of anaerobes increased with advancing age. The bacteria isolated from the larynx, the posterior pharyngeal wall and the palatine tonsil were similar. From the investigation of causative bacteria in laryngitis, we confirmed that the causative bacteria of laryngitis could often be isolated from the posterior pharyngeal wall.

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