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Alcaligenes faecalis


General Characteristics :

  • environmental organism
  • oxidase positive
  • motile
  • gram negative rods
  • thin, spreading colony with irregular edges on SBA; can produce green discoloration
  • “green apple” odor

Biochemical Reactions :

  • nonlactose fermentation on MAC
  • asaccharolytic; alkaline reaction
  • nitrate negative but nitrite positive
  • opportunistic pathogen
    • immunocompromised
    • underlying disease
    • intubated cystic fibrosis patients


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