title: [Qualitative and quantitative analysis of the bacterial flora in the trachea of healthy chickens].
abstract: The bacterial flora of the trachea of 17 to 38 day old chickens was quantitatively and qualitatively studied in two groups of animals from two different sources: an experimental disease-free flock and a commercial flock. In both groups of chickens, the aerobic flora consisted predominantly of Escherichia coli (E. coli), Streptococcaceae, Micrococcaceae and members of the genus Lactobacillus. Some differences between the two groups of animals were observed at the species level. Strictly anaerobic bacteria did not appear until the third week. No bacterial group seemed to predominate during the sampling period. The constant presence of Lactobacilli and E. coli in the trachea suggests that these organisms could play a prominent role in the bacterial ecosystem of the trachea.
mesh_terms: D000818:Animals; D001420:Bacteria, Aerobic / Q000302:isolation & purification*; D001421:Bacteria, Anaerobic / Q000302:isolation & purification*; D002645:Chickens / Q000382:microbiology*; D004463:Ecology; D013997:Time Factors; D014132:Trachea / Q000382:microbiology*
vernacular_title: Analyse qualitative et quantitative de la flore bactérienne dans la trachée du poulet sain.