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M. catarrhalis is a large, kidney-shaped, Gram-negative diplococcus. It can be cultured on blood and chocolate agar plates after an aerobic incubation at 37 °C for 24 hours. Cultures revealed gray-white hemispheric colonies about 1 mm in diameter. These colonies were fragile and easy to crumble, and appeared to have a waxy surface.
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. [ 2 ]
Cystine tryptic agar (CTA), also known as cystine trypticase agar, [1] [2] is a growth medium used for the identification of microorganisms. [ 3 ] It can be used to determine if organisms can ferment various carbohydrates , including maltose , lactose , and sucrose .
Moraxella spp Eye Neisseria spp Eye Staphylococcus aureus: Eye Staphylococcus epidermidis: Eye Streptococcus viridans: Eye Achromobacter spp Large intestine, small intestine (Ileon) Acidaminococcus fermentans: Large intestine Acinetobacter calcoaceticus: Large intestine Actinomyces spp Mouth, small and large intestine Actinomyces viscosus: Mouth
The Gonochek II test, a commercial biochemical test, is used to differentiate between Neisseria lactamica, Neisseria meningitidis, N. gonorrhoeae and Moraxella catarrhalis. The principle behind this test is to use enzymes native to the organism to create a colored product in the presence of foreign molecules.
Gram-negative bacteria are seen less frequently: Haemophilus influenzae , Klebsiella pneumoniae , Escherichia coli , Pseudomonas aeruginosa , Bordetella pertussis, and Moraxella catarrhalis are the most common. These bacteria often live in the gut and enter the lungs when contents of the gut (such as vomit or faeces) are inhaled.
Moraxella catarrhalis and Acinetobacter baumannii are human pathogens, and Moraxella bovis is the cause of "pinkeye" of cattle (infectious bovine keratoconjunctivitis ...
Chocolate agar showing Francisella tularensis colonies Comparison of two culture media types used to grow Neisseria gonorrhoeae bacteria. Known as overgrowth, the nonselective chocolate agar medium on the left, due to its composition, allowed for the growth of organismal colonies other than those of N. gonorrhoeae, while the selective Thayer–Martin medium on the right, containing ...