Haemophilus influenzae Infection - StatPearls - NCBI Bookshelf
Apr 27, 2023 · Haemophilus influenzae is characterized as a small (0.3 micrometer to 1 micrometer), facultatively anaerobic, pleomorphic, and capnophilic gram-negative coccobacillus of the family Pasteurellaceae. It requires a medium containing two erythrocyte factors, i.e., factor X (hematin) and factor V (phosphopyridine nucleotide), which are released ...
Haemophilus Species - Medical Microbiology - NCBI Bookshelf
Haemophilus influenzae requires hemin (factor X) and NAD+ (factor V) for growth. Other Haemophilus species require only NAD+ and therefore grow on blood agar. Typable H influenzae isolates are classified on the basis of seven antigenically distinct capsular polysaccharides; isolates lacking these polysaccharides are called nontypable.
Haemophilus influenzae: All You Need to Know
Aug 10, 2022 · Cell Morphology. Slender, short, gram negative rods or coccobacillus; 3-0.5 um X 0.5-1 um with rounded ends. Prolonged counterstaining for 5-15 minutes with very dilute carbol fuschin often gives satisfactory results. Non-Motile, No flagella or pilli; Capsules are present and important in pathogenicity. Encapsulated form are coccobacilli, CSF ...
Haemophilus influenzae - Habitat, Morphology, Pathogenesis, …
Nov 21, 2024 · Morphology of Haemophilus influenzae. Haemophilus influenzae is a Gram-negative bacterium with distinct physical and structural characteristics. Its morphology plays a key role in its identification and pathogenicity. Size and Shape: The bacterium is small and pleomorphic, with a typical size of approximately 1 × 0.3 micrometers. ...
Haemophilus influenzae: Introduction, Morphology, Pathogenicity
Jul 24, 2023 · Haemophilus influenzae is a Gram-negative bacterium that exhibits a specific morphology, which can be observed under a microscope. Here are the key morphological characteristics of H. influenzae: Shape: H. influenzae is a small, pleomorphic bacterium with a variety of shapes.
Classification, Identification, and Clinical Significance of
They may be divided into three groups that share certain phenotypic traits: the H. influenzae group, consisting of the three X-factor-dependent species, i.e., H. influenzae, Haemophilus aegyptius, and H. haemolyticus; the H. parainfluenzae group, consisting of the five X-factor-independent species, i.e., H. parainfluenzae, Haemophilus ...
Pathology Outlines - Haemophilus influenzae
Oct 1, 2024 · Chest Xray reveals a right lower lobe consolidation. The microbiology laboratory reports abundant H. influenzae from the sputum culture. What does H. influenzae require for growth? A. Hemin and NAD+. H. influenzae requires both the presence of hemin (X factor) and NAD+ (V factor) for growth.
Haemophilus influenzae and the lung ( Haemophilus and the …
Haemophilus influenzae is a gram-negative coccobacillus with a variable shape (pleomorphic). It grows both aerobically and anaerobically. Aerobic growth requires the presence of X (hemin) and V (nicotinamide adenine dinucleotide (NAD)) factors. In the laboratory it is classically grown on chocolate agar (Figure 1). Figure 1.
Haemophilus Influenzae Infections - Medscape
Aug 30, 2023 · Haemophilus influenzae is a small (1 µm × 0.3 µm), pleomorphic, gram-negative coccobacillus. [1, 2, 3, 4] Some strains of H influenzae possess a polysaccharide capsule, and these strains are...
Haemophilus influenzae: using comparative genomics to …
Aug 27, 2015 · Whole-genome single-nucleotide polymorphism data from 246 closely related global Haemophilus isolates, including 107 Australian isolate genomes generated in this study, were used to construct a whole-genome phylogeny. Based on this phylogeny, H. influenzae could be differentiated from closely related species.