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11 Cards in this Set
- Front
- Back
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Name 2 important distinctions between N. meningitiditis and N. gonorrhea.
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N. meningitidis has a capsule(and a vaccine) and reduces maltose. N. gonorrhea does not have a capsule(or a vaccine) and cannot reduce maltose).
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What are some clinically relevant gram neg. bacilli bacteria?
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Enteric-E. coli, Vibrio, Helicobacter, Campylobacter, Salmonella, Shigella
Respiratory- Bordetella, legionella, Haemophilus, Klebsiella, Pseudomonas, and Zoonotics(Francisella, Brucella, Yersinia, and Pateurella. |
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What Gram neg bacilli belong to Enterobacteriacae family?
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Escherichia, Proteus, Serratia, Enterobacter, Klebsiella, Shigella, Salmonella, Yersinia
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What three antigens are used for serotyping of Enterobacteriacae?
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O antigen(cell wall component of endotoxin), H antigen(flagella antigen, only on motile species), K antigen(capsule antigen, also used for virulence of Salmonella typhi.
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What features define Enterobacteriacae?
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Gram neg rods, glucose fermenting therefore oxidase negative(lack cytochrome c involved in electron transport chain of oxidation), facultative anerobes therefore catalase positive, and nitrite positive, (reduce nitrate to nitrite in metabolic processes.
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What features define Pseudomonas?
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Gram neg. rods, nonglucose fermenting therefore oxidase positive(have cytochrome c since necessary to oxidize glucose), obligateaerobes therefore also catalase positive, and nitrite negative.
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What bacteria are urease positive?
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H. pylori
Proteus Ureaplasma Nocardia and some strains of: Pseudomonas and Klebsiella. Urease degreades urea into ammonia and CO2. |
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What are the common spirochetes?
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Treponema, Borrelia and Leptospira
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What shape are spirochetes?
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Spiral shaped rods
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Are spirochetes mobile?
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Yes. Movement of internal filaments propel these bacteria.
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What type of microscopy is used to visualize spirochetes?
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Typically darkfield microscopy because spirochetes do not stain well with traditional stains. However silver or fluorescence stain can also be used.
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