Biochemical Test of Haemophilus influenzae

Biochemical Test of Haemophilus influenzae

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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

  1. Bergey’s Manual of Systematic Bacteriology Volume 2: The Proteobacteria, Part B:The Gammaproteobacteria.
  2. https://microbiologyinfo.com/haemophilus-influenzae/
  3. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC275054/
  4. https://www.cdc.gov/meningitis/lab-manual/chpt09-id-characterization-hi.pdf
  5. https://jcm.asm.org/content/jcm/7/6/519.full.pdf
  6. https://jcm.asm.org/content/jcm/11/1/22.full.pdf

About Author

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Sagar Aryal

Sagar Aryal is a microbiologist and a scientific blogger. He is doing his Ph.D. at the Central Department of Microbiology, Tribhuvan University, Kathmandu, Nepal. He was awarded the DAAD Research Grant to conduct part of his Ph.D. research work for two years (2019-2021) at Helmholtz-Institute for Pharmaceutical Research Saarland (HIPS), Saarbrucken, Germany. Sagar is interested in research on actinobacteria, myxobacteria, and natural products. He is the Research Head of the Department of Natural Products, Kathmandu Research Institute for Biological Sciences (KRIBS), Lalitpur, Nepal. Sagar has more than ten years of experience in blogging, content writing, and SEO. Sagar was awarded the SfAM Communications Award 2015: Professional Communicator Category from the Society for Applied Microbiology (Now: Applied Microbiology International), Cambridge, United Kingdom (UK). Sagar is also the ASM Young Ambassador to Nepal for the American Society for Microbiology since 2023 onwards.

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