Table of Contents
‘Gram Positive Negative (GNB)‘ is also called Gram Negative Rods (GNR) bacteria which take safranin after decolorization and stain pink or red on Gram’s staining. The most of GNR bacteria are medically important and among them few are Escherichia coli, Klebsiella pneumoniae, Salmonella enterica serotype Typhi, Shigella species, Proteus species, Citrobacter, Pseudomonas aeruginosa and Acinetobacter species.
The list of Gram negative bacilli (GNB) bacteria are as follows-
| S. No. | Bacteria |
| Medically Important GNR/GNB | |
| 1. | Escherichia coli |
| 2. | Klebsiella pneumoniae |
| 3. | Klebsiella oxytoca |
| 4. | Salmonella Typhi |
| 5. | Salmonella Paratyphi |
| 6. | Shigella boydii |
| 7. | Shigella dysenteriae |
| 8. | Shigella flexneri |
| 9. | Shigella sonnei |
| 10. | Vibrio cholerae |
| 11. | Proteus mirabilis |
| 12. | Proteus vulgaris |
| 13. | Citrobacter freundii |
| 14. | Citrobacter koseri |
| 15. | Enterobacter aerogenes |
| 16. | Enterobacter cloacae |
| 17. | Morganella morganii |
| 18. | Plesiomonas shigelloides |
| 19. | Edwardsiella tarda |
| 20. | Yersinia pestis |
| 21. | Yersinia enterocolitica |
| 22. | Providencia rettgeri |
| 23. | Providencia stuartti |
| 24. | Providencia alcalifaciens |
| 25. | Serratia marcescens |
| 26. | Pseudomonas aeruginosa |
| 27. | Stenotrophomonas maltophilia |
| 28. | Burkholderia mallei |
| 29. | Burkholderia pseudomallei |
| 30. | Burkholderia cepacia |
| 31. | Bacteroides ovatus |
| 32. | Bacteroides distasonis |
| 33. | Bacteroides thetaiotamicron |
| 34. | Bacteroides vulgatus |
| 35. | Fusobacterium necrophorum |
| 36. | Fusobacterium nucleatum |
| 37. | Porphyromonas species |
| 38. | Prevotella melaninogenica |
| 39. | Acinetobacter species |
| 40. | Aeromonas hydrophila |
| 41. | Alcaligenes species |
| 42. | Chryseobacterium spp. |
| Less Important GNR/GNB | |
| 43. | Aeromonas caviae |
| 44. | Aeromonas veronii biovar |
| 45. | Brevundimonas spp. |
| 46. | Eikenella corrodens |
| 47. | Mobiluncus spp. |
| 48. | Moraxella spp. |
| 49. | Pasteurella multocida |
| 50. | Pseudomonas fluorescens |
| 51. | Pseudomonas spp. |
| 52. | Ralstonia pickettii |
| 53. | Roseomonas spp. |
| 54. | Salmonella Choleraesuis |
| 55. | Serratia liquefaciens |
| 56. | Shewanella putrefaciens |
| 57. | Sphingobacterium spp. |
| 58. | Sphingomonas spp. |
| 59. | Vibrio parahaemolyticus |
| 60. | Vibrio vulnificus |
| 61. | Yersinia pseudotuberculosis |
| 62. | Ewingella americana |
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