Table of Contents
Is Moraxella catarrhalis catalase positive?
Moraxella catarrhalis, formerly known as Branhamella catarrhalis, is a Gram-negative, aerobic, nonmotile, nonspore-forming, oxidase-positive, and catalase-positive diplococcus.
Is Branhamella catarrhalis oxidase-positive?
B. catarrhalis is oxidase- and catalase positive and does not produce acidification of sugars. The strains reduce nitrate and hydrolyze tributyrin. The tributyrin hydrolysis proved to be useful for differentiation Branhamella from Neisseria.
Is Moraxella catalase negative?
Most Kingella species are catalase negative; Moraxella and most Neisseria species (except Neisseria elongata) are catalase positive.
Is Branhamella catarrhalis Gram positive or negative?
gram-negative
Moraxella (Branhamella) catarrhalis, formerly called Neisseria catarrhalis or Micrococcus catarrhalis, is a gram-negative, aerobic diplococcus frequently found as a commensal of the upper respiratory tract (124, 126; G.
How do you test for Moraxella catarrhalis?
Confirmation of the diagnosis of M catarrhalis infection is based on isolation of the organism in culture. Cultures can be taken from middle ear effusion, the nasopharynx, sputum, sinus aspirates, transtracheal or transbronchial aspirates, blood, peritoneal fluid, wounds, or urine.
Which of the following is characteristic of Moraxella catarrhalis?
Moraxella catarrhalis is a fastidious, nonmotile, Gram-negative, aerobic, oxidase-positive diplococcus that can cause infections of the respiratory system, middle ear, eye, central nervous system, and joints of humans.
Is branhamella Catarrhalis motile?
Does Moraxella catarrhalis produce beta-lactamase?
Beta-lactamases produced by the M. catarrhalis not only protect the pathogen but also inactivate penicillin, an antibiotic that is commonly used for the treatment of mixed infections caused by other airway pathogens such as Streptococcus pneumoniae and/or nontypeable Haemophilus influenzae [1, 4].
How is Moraxella catarrhalis tested?
Is Moraxella catarrhalis beta-lactamase positive?
Antibiotic susceptibility testing conducted in this study revealed that all the M. catarrhalis isolates were beta-lactamase producers. Studies from Australia, Europe, and the United States have reported beta-lactamase production in over 90% of the similar isolates [14].
Does Staphylococcus produce beta-lactamase?
Abstract. Staphylococcus aureus produces four types of beta-lactamase (A, B, C, and D).
Does Streptococcus produce beta-lactamase?
Streptococcus pneumoniae has become a paradigm for understanding the evolution of resistance mechanisms, the simplest of which, by far, is the production of beta-lactamases. As these enzymes are frequently plasmid encoded, resistance can readily be transmitted between bacteria.
Are all Staphylococcus beta lactamase positive?
All the strains of Staphylococcus aureus studied for beta-lactamase production showed positive results for beta-lactamase activity in all the three iodometric methods. Beta-lactamase production is a very important cause for antimicrobial resistance in bacteria.
What are the characteristics of Branhamella catarrhalis colonies on chocolate agar?
Branhamella catarrhalis has a pinkish-brown pigmentation on Chocolate Agar. Colonies at 48 hours are approximately 2-2.5mm in diameter, hemispherical, becoming larger and flat or convex with prolonged incubation. The colonies have a “hockey puck” consistency and may be moved intact over the surface of the medium using an inoculating loop.
What is the catalase test for Enterobacteriaceae?
Catalase test can be used as an aid to the identification of Enterobacteriaceae. Procedure of Catalase Test Tube Method. Pour 1-2 ml of hydrogen peroxide solution into a test tube. Using a sterile wooden stick or a glass rod, take several colonies of the 18 to 24 hours test organism and immerse in the hydrogen peroxide solution.
Is Branhamella catarrhalis a common pharynx resident?
Abstract. Branhamella catarrhalis was formerly regarded as a common, essentially harmless inhabitant of the pharynx. This misapprehension was caused, in part, by confusion with another pharyngeal resident, Neisseria cinerea. The two organisms can now be differentiated by the positive reactions of B.
How is Branhamella catarrhalispneumonia diagnosed?
The diagnosis of Branhamella catarrhalispneumonia in five cases was established by culture of pulmonary secretions obtained by transtracheal aspiration. B catarrhaliscaused an acute lobar pneumonia which usually responded promptly to appropriate antimicrobial therapy.