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18 Cards in this Set
- Front
- Back
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Which bacteria is responsible for a symptom that's often mistaken for appendicitus?
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Yersinia
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#1 cause of foodborne disease in Japan?
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V. parahemolyticus
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Virulence Factors of Vibria
1. parahemolyticus 2. vulnificus 3. cholera |
1. heat stable hemolysin
2. invasive polysaccharid capsule involve in Fe intake; LPS 3. CT bind w/GM1 receptor. Internalized; increased cAMP production; leads to water expulsion from intestinal cells-->diarrhea |
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Is Vibro deadly?
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vulnificus and cholera are.
Vulnificus: No GI, but septicemia, hypotension (50-90% death) Cholera: MASSIVE h20 loss results in "Cholera gravis": tachicardia, hypotension |
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What is responsible for 95% of all seafood related deaths in this county?
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V. vulnificus
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Which Vibrio sickness causes no GI symptoms?
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Vulnificus. Rare. Mostly septicemia, hypotension, prostration.
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What toxin functions as a "superantigen"?
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S. aureus toxin
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Which bacteria are halotolerant? Halophilic?
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Listeria (5-10%), Staph (20%!)
-this also affect they ability to grow in lower aw. Vibrio is halophilic (requires salt) |
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What foods are most susceptible to staph contamination?
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Those with low aw to inhibit other bacteria - cake icing!
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Which one causes perforation of the SI?
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Shigella
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Which bacteria have low infectious doses?
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Shigella and listeria (systemic complications)
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What are the strains of l. monocytogenes that are pathogenic?
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1/2a, 1/2b and 4b. 4B is most common & causes 50% of cases ww.
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Why is MOX agar used for listeria?
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It contains esculin; listeria can hydrolize ecsulain and a subsequent reaction then produces a black precipitate.
Sheepblood agar: hemolysis |
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Why should I remember that listeria makes a hot dog weepy?
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It produces acid!!!!!
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What is unique about the way listeria causes infection?
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In invades cell intracellularly: cell-to-cell transmission.
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Growth at low temperatures enhances the virulence of which bacteria?
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Yersinia: at low T's, yersinia is found w/a flagella: motility.
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Where are C. botulinum spores found?
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Ubiquitous in nature: soil!!
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Why do infants get botulinum as an intoxico infection and not an intoxication?
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Well, they could, but they are also infectable via the spores since there is not gut flora. This is also true in adults on antibiotic theapy.
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