Escherichia Coli – Enteric Bacteria
About the Lecture
The lecture Escherichia Coli – Enteric Bacteria by Vincent Racaniello, PhD is from the course Bacteria.
Included Quiz Questions
Which of the following organisms is the most common cause of urinary tract infections?
- E. coli
- Shigella
- Salmonella
- V. cholerae
- S. aureus
What is the morphology of E. coli?
- Gram-negative rod
- Gram-positive rod
- Gram-negative cocci
- Gram-positive bacillus
- Gram-positive spirochete
Which of the following is NOT a common cause of E. coli infection?
- Contaminated respiratory droplets
- Improper food preparation/handling
- Manure contamination of food
- Contaminated irrigation of fruits and vegetables
- Contaminated drinking water
Traveler's diarrhea is most commonly caused by which of the following?
- ETEC
- EHEC
- V. cholerae
- EPEC
- EAggEC
What is the mechanism of action of LT enterotoxin?
- Activates adenylate cyclase to increase cAMP concentrations
- Inhibits the 60s subunit of ribosomes
- Increases levels of cGMP in the intestine
- Decreases Cl absorption, increases Na secretion
- Decreases secretion of fluids and electrolytes, leading to cell lysis
Which of the following is the correct pairing of ETEC enterotoxins with their pathologic effect?
- ST toxin — increased cGMP; LT toxin — increased cAMP
- ST toxin — increased cAMP; LT toxin — increased cGMP
- ST toxin — decreased cGMP; LT toxin — increased cAMP
- ST toxin — increased cGMP; LT toxin — decreased cAMP
- ST toxin — decreased cAMP; LT toxin — decreased cGMP
The pathogenesis of EPEC is mediated by...
- ...intimin.
- ...LT toxin.
- ...ST toxin.
- ...Shiga-like toxin.
- ...pili.
Which of the following toxins is associated with VTEC?
- Shiga toxin
- Cholera toxin
- LT toxin
- ST toxin
- Intimin
Which of the following is NOT associated with EHEC serotype O157:H7?
- Traveler's diarrhea
- HUS
- Shiga toxin
- Undercooked hamburger meat
- Contaminated water
Which of the following symptoms is NOT seen with hemolytic uremic syndrome?
- Bloody sputum
- Kidney failure
- Thrombocytopenia
- Lysis of red blood cells
- Damage to small blood vessels
An HIV-positive patient residing in a developing country would be most susceptible to which of the following pathogens?
- EAEC
- EHEC
- ETEC
- EPEC
- EIEC
EAggEC produces a toxin that does which of the following?
- Increases cGMP in the enterocyte
- Acts like ETEC LT toxin
- Increases cAMP in the enterocyte
- Acts like cholera toxin
- Acts like Shiga toxin
The presence of blood in dysenteric diarrhea is due to which of the following?
- Invasion into enterocytes with damage to the mucosa
- Bacterial pili adhesion
- Production of enterotoxins
- Biofilm formation
- Stimulation of angiogenesis
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Author of lecture Escherichia Coli – Enteric Bacteria
Vincent Racaniello, PhD
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