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Flashcards in ID Deck (17):
0

Enterohemorrhagic strain E.
coli (EHEC) H157:H7 can be complicated by?

Thrombotic thrombocytopenic pursues
(TTP)
Hemolytic uremic syndrome (HUS)

1

The reservoir for EHEC H157:H7 is ?

Cattle

2

The outbreak of Enterohemorrhagic strain E.
coli (EHEC) H157:H7 most often has been associated with ?

consumption of inadequately cooked Hamburger (ground beef)

3

Risk of infection/ transmission after exposure

Virus exposure Risk of transmission

HIV+ 0.1-0.3%
HCV + 2%
HBsAg+/HBeAg- 23-37% (1/3)
HBsAg+/HBeAg+ 37-62% (1/3 -2/3)

4

Which GI organism is Least susceptible to chlorination ?
A. Shigella
B. E Coli
C. Cholera
D. Bacillus anthracis

Bacillus anthracis spores were less susceptible to chlorine disinfection than the gram-negative organizations.

5

Anthrax prophylaxis

8wk of Abx

6

Anthrax PEP

Abx for 60days + 3 doses of anthrax vaccine adsorbed (AVA)

Ciprofloxacin, doxycycline, and penicillin G procaine have demonstrated efficacy for inhalation anthrax PEP.

7

Vibrio parahaemolyticus

- is associated with fecally contaminated water and contaminated raw fish and shellfish

8

E. Coli

Is linked to raw milk and raw or partially cooked meats and poultry.

9

Yersinia

Is associated with raw meat and meat products (esp. Pork), poultry, fresh vegetables, and milk

10

Campylobacter

Is associated with raw poultry and meat, raw milk and unpasteurized dairy products, and fecally contaminated raw vegetables.

11

Staph aureus

Is associated with food that are inadequately cooker or refrigerated, such as pastries, custards, salad, dressings, sandwiches, and meat products.
Staph aureus produces a heat stable toxin which survives boiling for 25 min.
It is also highly tolerate to salt.

12

E. Coli 0157:H7

1. Requires low does (less than 100 organisms) for diarrheal response
2. An important cause of both bloody diarrhea and hemolytic uremic syndrome (HUS)
3. Most commonly linked to consumption of undercooked ground beef

13

Cryptosporidiosis

- fecal-oral transmission, person-to-person contact, or animal-to-person contact
- ingestion of fecally contaminated water appears to be of the greatest public health significance
- effective preventive measures include boiling or filtration
- Cryptosporidium oocysts may be as small as 2-3 micrometers in diameter; therefore, a minimum filter pore size of 1 micrometer should be used.
- chemical disinfectant are not effective against the oocysts (chlorine resistant)
- primary symptoms include diarrhea accompanied by abdominal cramping
- Dx may be made by identifying oocysts in fecal smears

14

Which GI organism is Least susceptible to chlorination ?
A. Cryptosporidium
B. Giardiasis
C. Cholera
D. Bacillus anthracis

A

15

Cryptosporidium and Gardiasis,Which is more resistant to chlorine?

Cryptosporidium

16

Dengue is transmitted through ? Vector ?

Aedes aegypti