ID Flashcards
The reservoir for EHEC H157:H7 is ?
Cattle
Enterohemorrhagic strain E.
coli (EHEC) H157:H7 can be complicated by?
Thrombotic thrombocytopenic pursues
(TTP)
Hemolytic uremic syndrome (HUS)
The outbreak of Enterohemorrhagic strain E.
coli (EHEC) H157:H7 most often has been associated with ?
consumption of inadequately cooked Hamburger (ground beef)
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)
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.
Anthrax prophylaxis
8wk of Abx
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.
Vibrio parahaemolyticus
- is associated with fecally contaminated water and contaminated raw fish and shellfish
E. Coli
Is linked to raw milk and raw or partially cooked meats and poultry.
Yersinia
Is associated with raw meat and meat products (esp. Pork), poultry, fresh vegetables, and milk
Campylobacter
Is associated with raw poultry and meat, raw milk and unpasteurized dairy products, and fecally contaminated raw vegetables.
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.
E. Coli 0157:H7
- Requires low does (less than 100 organisms) for diarrheal response
- An important cause of both bloody diarrhea and hemolytic uremic syndrome (HUS)
- Most commonly linked to consumption of undercooked ground beef
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
Which GI organism is Least susceptible to chlorination ? A. Cryptosporidium B. Giardiasis C. Cholera D. Bacillus anthracis
A