Image Source: Manitoba Health and Fine Art America.
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Some of the characteristics are as follows:
| Basic Characteristics | Properties (Haemophilus influenzae) |
| Capsule | Strain-dependent |
| Catalase | Positive (+ve) |
| Flagella | Negative (-ve) |
| Gas | Negative (-ve) |
| Gram Staining | Gram-negative |
| H2S | Negative (-ve) |
| Hemolysis | Negative (-ve) |
| Indole | Variable |
| Motility | Negative (-ve) |
| Nitrate Reduction | Positive (+ve) |
| Nitrite Reduction | Negative (-ve) |
| Oxidase | Positive (+ve) |
| Pigment | Absent or yellowish |
| Shape | Coccobacilli or small regular rods |
| Urease | Variable |
| V-factor requirement | Positive (+ve) |
Fermentation of |
|
| Adonitol | Negative (-ve) |
| Arabinose | Negative (-ve) |
| Cellobiose | Negative (-ve) |
| Dulcitol | Negative (-ve) |
| Erythritol | Negative (-ve) |
| Fructose | Negative (-ve) |
| Galactose | Positive (+ve) |
| Glucose | Positive (+ve) |
| Glycerol | Negative (-ve) |
| Inositol | Negative (-ve) |
| Inulin | Negative (-ve) |
| Lactose | Negative (-ve) |
| Maltose | Positive (+ve) |
| Mannitol | Negative (-ve) |
| Mannose | Negative (-ve) |
| Melibiose | Negative (-ve) |
| Raffinose | Negative (-ve) |
| Rhamnose | Negative (-ve) |
| Ribose | Positive (+ve) |
| Salicin | Negative (-ve) |
| Sorbitol | Negative (-ve) |
| Sorbose | Negative (-ve) |
| Sucrose | Negative (-ve) |
| Trehalose | Negative (-ve) |
| Xylose | Positive (+ve) |
Enzymatic Reactions |
|
| Alkaline Phosphatase | Positive (+ve) |
| Arginine Dihydrolase | Negative (-ve) |
| Esculin Hydrolysis | Negative (-ve) |
| Fucosidase | Negative (-ve) |
| IgA1 protease | Positive (+ve) |
| Lysine decarboxylase | Variable |
| Neuraminidase | Positive (+ve) |
| ONPG (β-galactosidase) | Negative (-ve) |
| Ornithine Decarboxylase | Variable |
References
- Bergey’s Manual of Systematic Bacteriology Volume 2: The Proteobacteria, Part B:The Gammaproteobacteria.
- https://microbiologyinfo.com/haemophilus-influenzae/
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC275054/
- https://www.cdc.gov/meningitis/lab-manual/chpt09-id-characterization-hi.pdf
- https://jcm.asm.org/content/jcm/7/6/519.full.pdf
- https://jcm.asm.org/content/jcm/11/1/22.full.pdf
