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33 Cards in this Set
- Front
- Back
Name 7 characteristics common to all enteric bugs:
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1. GNB
2. Oxidase neg 3. Ferment Glu to Acid or A/G 4. Reduce Nitrate->Nitrite 5. If motile, peritrichous 6. Facultative anaerobes 7. Have endotoxin |
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What TSA results are obtained from all enteric bugs?
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Either K/A or A/A
None will be K/K or K/NC |
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What is endotoxin composed of?
What does it cause? |
-Lipopolysaccharide
-Causes shock and sepsis. |
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Which enteric is the #1 cause of shock/sepsis?
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E. coli
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What would you NOT prescribe for enterics?
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-Penicillins
-Erythromycin -Clindamycin -Oxacillin/methicillin |
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Name some antibiotics that WOULD be effective vs. enterics:
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Ampicillin, Cephalosporins, Chloramphenicol, Gentamicin, Imipenem, Kanamycin, Piperacillin, SXT, Tetracycline.
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List the 9 NONPATHOGENIC enteric bugs:
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1. E. coli
2. Klebsiella 3. Enterobacter 4. Hafnia 5. Serratia 6. Citrobacter 7. Providencia 8. Proteus 9. Morganella |
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What 5 infections are caused by enteric bugs?
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1. UTI
2. Pneumonia 3. Wound 4. Sepsis 5. Neonatal meningitis |
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What are the five enteric PATHOGENS?
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1. Yersinia enterocolitica
2. E. coli 3. Shigella 4. Edwardsiella tarda 5. Salmonella |
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What enteric bug causes Bacillary dysentery?
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Shigella
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Name 4 species of Shigella:
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1. dysenteriae (4th)
2. flexneri (2nd) 3. boydii (3rd) 4. sonnei (most common) |
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What is the incubation time before dysentery develops?
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1 1/2 to 3 days
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How does dysentery differ from food poisoning?
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-Food poisoning (e.g. Staph, B. cereus) is due to toxins.
-Foodborne illness (this, Salmonella, Campy, Vibrio) is due to proliferation within the intestinal tract. |
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What is Edwardsiella tarda associated with?
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Fish and reptiles
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Which pathogen is most frequently encountered?
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Salmonella
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What 2 types of disease do Salmonella species cause?
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1. Enterocolitis
2. Typhus |
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How is Salmonella assoc. enterocolitis transmitted?
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Via ingestion of undercooked poultry
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What species causes typhus?
What are symptoms of it? |
Salmonella typhi
Sx: febrile disease, organomegaly, rash |
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How is Typhus different from Salmonella and Shigella?
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Incubation periods:
Salmonella = 8-24 hrs Shigella = 36-72 hrs S. typhi = 8-14 DAYS |
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Where is S. typhi stored when a patient is a carrier of it?
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In the gallbladder - so it is continuously shed in stools.
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What specimens are best for isolating S. typhi from an infected patient? At what times?
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1st week: blood culture
2nd/3rd wk: Stool |
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Name 3 species of yersinia:
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1. Yersinia enterocolitica
2. Yersinia pestis 3. Yersinia pseudotuberculosis |
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-What does Y. enterocolitica cause?
-What type of media is needed to isolate it? |
-Enterocolitis
-CIN media |
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What three E. coli species are pathogenic?
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-Enteropathogenic (uncommon)
-Enterotoxigenic (Mexicans) -0157:H7 |
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What media is used for E. Coli 0157H7? Why?
What is another variation of SMAC? |
-SMAC - extra carb = sorbitol
Normal enterics ferment =PINK. E. Coli 0157:H7 doesnt =CLEAR. -Variation: CT-SMAC contains antibiotics to inhibit normal E. coli. |
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What does E. Coli 0157:H7 cause?
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Hemolytic Uremic Syndrome
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What is the natural reservoir of E. Coli 0157:H7?
Therefore it is transmitted from what 3 sources? |
Cows = reservoir
Transmission via: -Undercooked beef -Apple cider -petting zoos |
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What two enteric bugs cause dysentery?
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-Shigella
-E. Coli 0157:H7 |
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With what disease is Y. pestis associated?
How is it transmitted? |
Bubonic plague
-Rat flea bite - zoonotic |
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What are 2 forms of the plague and how do they differ?
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-Bubonic
-Pneumonic Only pneumonic is transmitted person-person. |
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Which enteric tends to have a red pigment?
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Serratia
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Which enteric smells chocolatey?
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Providencia
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Which enteric swarms?
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Proteus
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