What shape is Moraxella catarrhalis?
(coccobacillus) Curved, straight or bean-shaped: bacilli come in many variants and are widely spread. Moraxella catarrhalis is an aerobic, Gram-negative coccobacillus – previously also referred to as Neisseria catarrhalis or Micrococcus catarrhalis.
Is Moraxella catarrhalis rod-shaped?
Moraxella catarrhalis was previously placed in a separate genus named Branhamella. The rationale for this was that other members of the genus Moraxella are rod-shaped and rarely caused infections in humans.
How do you identify Moraxella?
Moraxella species are usually catalase and oxidase positive and do not produce acid from carbohydrates. Nitrate may or may not be reduced. Common characteristics of the Moraxella genus include a lack of colony pigmentation; Gram negative staining coccobacillus and Bacillus morphology (except M.
What is the shape of branhamella Catarrhalis?
MICROSCOPIC APPEARANCE
| Gram Stains: | Gram-negative cocci (subgenus Branhamella ). May resist decolorization and appear gram-positive. |
|---|---|
| Morphology: | Absence of flagella, both rod-shaped and coccal species may be fimbriated. |
| Size: | 1.0-1.5 micrometers by 1.5-2.5 micrometers. |
Is Moraxella catarrhalis oxidase-positive?
Moraxella catarrhalis, formerly known as Branhamella catarrhalis, is a Gram-negative, aerobic, nonmotile, nonspore-forming, oxidase-positive, and catalase-positive diplococcus.
What are the virulence factors of Moraxella catarrhalis?
Moraxella catarrhalis is a common human respiratory tract pathogen. Its virulence factors associated with whole bacteria or outer membrane vesicles (OMVs) aid infection, colonization and may induce specific antibodies.
Is Moraxella catarrhalis viral or bacterial?
Moraxella catarrhalis (M. catarrhalis) is a type of bacteria that’s also known as Neisseria catarrhalis and Branhamella catarrhalis. It used to be considered a normal part of the human respiratory system, but more recent research shows that can it sometimes causes infections. Many young children have M.
How is Moraxella catarrhalis identified?
catarrhalis colonies is their ability to be slid across the agar surface without disruption, known as the ‘hockey puck sign’. A combination of sputum Gram stain examination and the hockey puck sign leads to prompt diagnosis and treatment of M. catarrhalis infection in patients with pneumonia.
How do you identify Moraxella catarrhalis?
catarrhalis must be distinguished from Neisseria spp. Colonies of M. catarrhalis may have a rough surface and be friable in consistency, pinkish-brown in color, and opaque.
Is branhamella Catarrhalis motile?
Moraxella Catarrhalis, formerly known as Branhamella Catarrhalis, is an infrequent cause of peritonitis in peritoneal dialysis patients. So far, only five cases have been reported in the literature [1–4]. Moraxella species are gram negative, non-motile diploccocci and may be encapsulated.
Which organisms are oxidase positive?
Oxidase Positive Organisms: Pseudomonas, Neisseria, Alcaligens, Aeromonas, Campylobacter, Vibrio, Brucella, Pasteurella, Moraxella, Helicobacter pylori, Legionella pneumophila, etc.
How does Moraxella catarrhalis spread?
The organism appears to spread contiguously from its colonizing position in the respiratory tract to the infection site. There is no pathognomonic feature of M. catarrhalis otitis media, acute or chronic sinusitis, or pneumonia.
What are the characteristics of Moraxella catarrhalis colonies on blood agar?
Moraxella catarrhalis grows well on blood agar and chocolate agar, producing small, nonhemolytic, grayish-white colonies that slide across the agar surface, like a hockey puck, when pushed with a bacteriologic loop. Suzanne J.C. Verhaegh,
What is the scientific name of Moraxella?
Moraxella has had a bunch of names over the last century. When it was first discovered it was named Micrococcus catarrhalis, then its name was changed into Neisseria catarrhalis. Later it was moved to another genus, called Branhamella, and finally it was moved again to genus Moraxella, species Moraxella catarrhalis.
Is Moraxella catarrhalis Gram positive or negative?
The gender Moraxella on Gram stain they can be seen as Gram negative diplobacilli, coccobacilli or diplococci, depending on the species. In the particular case of Moraxella catarrhalis, it is the only species that has a Gram negative diplococcal morphology.
What are the macroscopic and cultural characteristics of Moraxella atlantae?
Some species of the Genus are mentioned below Moraxella and its macroscopic or cultural characteristics. Moraxella atlantae it grows slowly in culture media and produces colonies with a tendency to form an invasive zone after 48 hours of incubation.
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