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In addition, growth analyses revealed that a HumA-deficient mutant of M. catarrhalis (7169::humA) is restricted for growth in the presence of hemin as the sole iron source compared to the wild-type strain. BSCI 424 — PATHOGENIC MICROBIOLOGY — Fall 2000 Corynebacterium Summary. Gram stain of Corynebacterium spp. demonstrating "Chinese letters" formations.

M catarrhalis gram stain

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2013-12-10 2019-01-29 Moraxella is a genus of gram-negative bacteria in the family Moraxellaceae.It is named after the Swiss ophthalmologist Victor Morax.The organisms are short rods, coccobacilli, or as in the case of Moraxella catarrhalis, diplococci in morphology, with asaccharolytic, oxidase-positive, and catalase-positive properties. M. catarrhalis is the clinically most important species under this genus. M. catarrhalis can utilize human transferrin, human lactoferrin, and to some extent human hemoglobin as iron sources, which is mediated by many cell surface iron-binding proteins. There are two specific lactoferrin-binding proteins, LbpA and LpbB, two specific transferrin-binding proteins, TbpA and TbpB, hemoglobin utilization protein, mHuA. BSCI 424 — PATHOGENIC MICROBIOLOGY — Fall 2000 Corynebacterium Summary. Gram stain of Corynebacterium spp. demonstrating "Chinese letters" formations.

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cat… M. catarrhalis is easily overlooked in culture because it is phenotypically identical to Neisseria in Gram stain and on culture plates. • M. catarrhalis produces oxidase, catalase, and DNAse, which are used for speciation. Diagnosis • 2015-02-08 2002-01-01 View M. catarrhalis.docx from BIOSCI 383 at University of Wisconsin, Milwaukee. To start the process of determining what my morphological unknown slant #51 was, I prepared a smear to do a Gram stain.

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M catarrhalis gram stain

Moraxella(Branhamella) catarrhalis, formerly called Neisseria catarrhalisor Micrococcus catarrhalis, is a gram-negative, aerobic diplococcus frequently found as a commensal of the upper respiratory tract (124, 126; G. Ninane, J. Joly, P. Piot, and M. Kraytman, Letter, Lancet ii:149, 1997).

It is a common cause of otitis media in children and exacerbations of chronic obstructive pulmonary disease (COPD) in adults. 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.
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This gram-positive bacterium appears as chains of cocci, as seen in Figure 1. Because unencapsulated strains of H. influenzae and M. catarrhalis are involved   The second culture is a blood culture with gram positive rods. This is with a broad spectrum penicillin such as amoxicillin, but some M. catarrhalis are resistant. Feb 6, 2019 191. 192.

will develop long filamentous or spindle-shaped forms. Acinetobacter Species. Moraxella catarrhalis is a human pathogen causing otitis media in infants and respiratory infections in adults, particularly patients with chronic obstructive pulmonary disease.
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Se hela listan på INTRODUCTION. Moraxella catarrhalis is a gram-negative diplococcus that commonly colonizes the upper respiratory tract. It is a leading cause of otitis media in children, acute exacerbations of chronic obstructive pulmonary disease (COPD), and acute bacterial rhinosinusitis. The epidemiology, pathogenesis, clinical manifestations, diagnosis, View M. catarrhalis.docx from BIOSCI 383 at University of Wisconsin, Milwaukee.

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Moraxella catarrhalis is the most commonly isolated species and is responsible for cases of acute otitis media (in children older than 3 months old), chronic and serious otitis media (fever, acute ear pain, irritability, and can escalate to sepsis and CNS infection), acute and chronic sinusitis (occasional fever, nasal or postnasal discharge, cough, fetid breath, sinus pain, and headache Isolates of M. catarrhalis were not of prime interest in this study because these isolates can be identified to genus and species using standard laboratory methods. M. catarrhalis are Gram-negative diplococci (not diplobacilli) closely resembling Neisseria but are oxidase-positive, fast SUMMARY In recent years, Moraxella catarrhalis has established its position as an important human mucosal pathogen, no longer being regarded as just a commensal bacterium. Further, current research in the field has led to a better understanding of the molecular mechanisms involved in M. catarrhalis pathogenesis, including mechanisms associated with cellular adherence, target cell invasion The prevalence of M. catarrhalis colonization depends on age. About 1 to 5% of healthy adults have upper respiratory tract colonization. Nasopharyngeal colonization with M. catarrhalis is common throughout infancy, may be increased during winter months, and is a risk factor for acute otitis media; early colonization is a risk factor for recurrent otitis media.

A comparison with gram-staining and immunofluorescence. Coccus morphology: monococcus,. microscopic view of gonorrhea (Neisseria gonorrhoeae) gram-stained. Moraxella catarrhalis bacteria, 3D illustration.