title: Occurrence and clinical significance of tyrosine clearing positive Citrobacter freundii in human faecal specimens.
abstract: 59 tyrosine clearing positive Citrobacter strains were isolated from a total of 2062 human faecal specimens, specifically from 1167 healthy people and from 895 patients suffering from different gastrointestinal syndromes. All strains were identified biochemically as Citrobacter freundii. Citrobacter diversus 100% positive for tyrosine clearing could not be isolated in any case. Citrobacter freundii was found twice as frequently in stools of healthy human beings than of patients. There is a statistical significance of p less than 0.05 for the occurrence of tyrosine clearing Citrobacter freundii in healthy persons.
mesh_terms: D002954:Citrobacter / Q000302:isolation & purification* / Q000378:metabolism / Q000472:pathogenicity; D005243:Feces / Q000382:microbiology*; D005767:Gastrointestinal Diseases / Q000382:microbiology*; D006801:Humans; D014443:Tyrosine / Q000378:metabolism*
chemical_list: D014443:Tyrosine