Citrobacter freundii colony characteristics on CLED agar of Urine Culture
Table of Contents
Citrobacter freundii is a member of the family, Enterobacteriaceae and it is a Gram-negative bacillus, non-sporing, non-encapsulated, aerobic, or facultative anaerobe that causes various types of infections of the urinary tract, respiratory tract, peritoneum, liver, bone, endocardium, intestines, soft tissue, meninges, and the bloodstream. It’s also the causative agent of other diseases, including biliary, hepatic, and pancreatic diseases.
| Basic Features | Properties |
| 1. Gram Staining | Gram-Negative Rods (GNRs) |
| 2. Spore | Non-Sporing |
| 3. Capsule | Negative |
| 4. Motility | Motile |
| 5. Pigment | Negative |
| 6. Growth in potassium cyanide (KCN) medium | Positive |
| 7. Catalase test | Positive |
| 8. Oxidase test | Negative |
| 9. Nitrate reduction test | Positive |
| 10. MR (Methyl Red) test | Positive |
| 11. VP (Voges- Proskauer) assay | Negative |
| 12. OF (Oxidative-Fermentative) test | Fermentative/Facultative Anaerobes |
| 13. Gas | Positive |
| 14. H2S production | Positive |
| 15. Indole formation | Negative |
| 16. Urease/ urea hydrolysis test | Variable |
| 17. Citrate/ citrate utilization | Positive |
| 18. DNase test | Negative |
| 19. Glucose fermentation | Positive |
| 20. Maltose fermentation | Positive |
| 21. Lactose fermentation | Positive |
| 22. Sucrose fermentation | Positive |
| 23. Xylose fermentation | Positive |
| 24. Mannitol fermentation | Positive |
| 25. Acetate Utilization | Positive |
| 26. ONPG (β-galactosidase) | Positive |
| 27. Phenylalanine Deaminase (PDA)/PPA Test | Negative |
| 28. Lipase test | Negative |
| 29. Esculin Hydrolysis test | Negative |
| 30. Lysine Decarboxylase Test | Negative |
| 31. Ornithine Decarboxylase Test | Negative |
| 32. Arginine Dihydrolase Test | Variable |
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