Biochemical Test of Haemophilus aegyptius

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Biochemical Test of Haemophilus aegyptius

Some of the characteristics are as follows:

Basic Characteristics Properties (Haemophilus aegyptius)
Capsule Negative (-ve)
Catalase Positive (+ve)
Gas Negative (-ve)
Gram Staining .Gram-negative
H2S Negative (-ve)
Hemolysis Negative (-ve)
Indole Negative (-ve)
Motility Negative (-ve)
Nitrate Reduction Positive (+ve)
Nitrite Reduction Negative (-ve)
Oxidase Positive (+ve)
Shape Long slender rods
Urease Positive (+ve)
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)
Glucose Positive (+ve)
Glycerol Negative (-ve)
Inositol Negative (-ve)
Inulin Negative (-ve)
Lactose Negative (-ve)
Mannitol Negative (-ve)
Mannose Negative (-ve)
Melibiose Negative (-ve)
Raffinose Negative (-ve)
Rhamnose Negative (-ve)
Salicin Negative (-ve)
Sorbitol Negative (-ve)
Sorbose Negative (-ve)
Sucrose Negative (-ve)
Trehalose Negative (-ve)
Xylitol 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 Negative (-ve)
Neuraminidase Positive (+ve)
ONPG (β-galactosidase) Negative (-ve)
Ornithine Decarboxylase Negative (-ve)

References

  1. Bergey’s Manual of Systematic Bacteriology Volume 2: The Proteobacteria, Part B: The Gammaproteobacteria.
  2. https://jcm.asm.org/content/jcm/11/1/22.full.pdf
  3. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC266654/
  4. https://www.ncbi.nlm.nih.gov/books/NBK8458/
  5. https://www.ncbi.nlm.nih.gov/pubmed/6979159
  6. https://www.cdc.gov/hi-disease/about/diagnosis-treatment.html

About Author

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Sagar Aryal, PhD

Dr. Sagar Aryal is a microbiologist, researcher, and science communicator from Nepal. He is also co-founder and Research Head of the Department of Natural Products at the Kathmandu Research Institute for Biological Sciences (KRIBS), where he leads research on natural product discovery and microbial biodiversity. Dr. Aryal earned his Ph.D. in Microbiology from Tribhuvan University, Kathmandu, Nepal, in 2025, supported by a DAAD Research Grant and a University Grants Commission (UGC) Nepal Ph.D. Fellowship. His research interests include Actinomycetes, Myxobacteria, microbial taxonomy, and natural products, particularly the discovery of bioactive compounds with potential pharmaceutical applications. He isolated and identified Nocardia nepalensis, a novel bacterial species from Nepal, contributing to understanding microbial diversity in the region. Dr. Aryal has published more than 16 research articles in international journals and contributed three book chapters to established academic publications. He has presented scientific research findings and developed international research collaborations through visits to more than 18 countries across Asia, Europe, North America, and Oceania. From 2023 to 2025, he served as the American Society for Microbiology (ASM) Young Ambassador to Nepal. Since December 2025, he has served as an Editorial Board Member of Scientific Reports, a Nature Portfolio journal. In recognition of his scientific contributions, Dr. Aryal received the NAST Science and Technology Youth Award 2025 from the Nepal Academy of Science and Technology. He previously received the Frs. Locke and Stiller Research Award (LSRA) for the 2017-2018 cycle from St. Xavier's College, Kathmandu, and a Nepal Academy of Science and Technology (NAST) Research Grant for 2017-2018. Alongside his scientific career, Dr. Aryal has more than 15 years of experience in blogging, content writing, and search engine optimization (SEO).

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