The genus Haemophilus includes a number of species that cause a wide variety of infections but share a common morphology and a requirement for blood-derived factors during growth that has given the genus its name. Haemophilus influenzae, the major pathogen, can be separated into encapsulated or typable strains, of which there are seven types …

These are pleomorphic Gram-negative coccobacilli. The laboratory diagnosis of H. influenzae is based on growth and colony morphology in chocolate agar, and cell morphology on Gram staining. These are confirmed by the haemophilic character of the genus that reflects a requirement for either or both of the two factors called X and V. The X factor comprises haemin or other iron-containing ...

Apr 27, 2023 · Haemophilus influenzae disease is a name collectively used for any kind of infection caused by the bacteria called Haemophilus influenzae. They are broadly classified into encapsulated and non-encapsulated types. The encapsulated bacterium is further subdivided into ‘a’ through ‘f’ subtypes based on capsule type. The most familiar and predominant form is H. influenzae type b (Hib ...

Jul 24, 2023 · Morphology 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.

Aug 10, 2022 · Haemophilus influenzae: Habitat, Cell Morphology, Cultural Characteristic, Biochemical Tests, Pathogenicity, Diagnosis and Treatment

H. influenzae in a Gram stain of a sputum sample appears as Gram-negative coccobacilli. Haemophilus influenzae requires X and V factors for growth and therefore, it grows only around the paper disk that has been impregnated with X and V factors on non-selective and non-enriched media like nutrient agar or MHA.

Haemophilus influenzae is a nonmotile, Gram-negative, rod-shaped bacterium. The rounded ends of short (0.5-1.5 μm) bacilli make many appear round, hence the term coccobacilli. Microscopy from culture. Gram stain, magnification ×1000.haemophilus influenzae cell morphology, Gram stain, micrograph

Nov 30, 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. In fresh cultures, it primarily appears as coccobacilli, while ...

Introduction Haemophilus influenzae (often abbreviated as H. influenzae) is a small, Gram-negative coccobacillus bacterium that can cause a variety of infections in humans. Despite its name, it does not cause influenza (the flu); influenza is caused by a virus. The name originated from initial isolation attempts during the 1892 influenza pandemic, as it …

Haemophilus influenzae. Gram stain and cell morphology. Haemophilus micrograph, appearance under microscope. Haemophilus cell morphology. Haemophilus microscopic picture. Haemophilus influenzae micrograph. Morphology: short gram-negative rods or coccobacilli.