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BMS 602 - Exam #3 Questions and Answers 100% Solved
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BMS 602 - Exam #3 Questions and Answers 100% Solved How does E.coli become virulent? - acquires virulence factors via horizontal gene transfer What does E.coli ferment? - lactose, sucrose and glucose What are the characteristics of E.coli on MacConkey agar and TSI? - red colonies on MacConkey...

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  • October 30, 2024
  • 16
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • BMS 602
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©NINJANERD 2024/2025. YEAR PUBLISHED 2024.
BMS 602 - Exam #3 Questions and

Answers 100% Solved


How does E.coli become virulent? - ✔✔acquires virulence factors via

horizontal gene transfer

What does E.coli ferment? - ✔✔lactose, sucrose and glucose

What are the characteristics of E.coli on MacConkey agar and TSI? -

✔✔red colonies on MacConkey agar and yellow TSI slants

What kind of hemolysis does E.coli cause? - ✔✔beta

Is E.coli motile? - ✔✔yes

What is the most common disease caused by E.coli? - ✔✔gastroenteritis

which is caused by ingestion of contaminated food or water



self limiting

What kind of pathogen is E.coli? - ✔✔opportunistic

What are some ways that E.coli is an opportunistic pathogen? -

✔✔perforation of the intestine allows bacteria to infect the peritoneal cavity

,©NINJANERD 2024/2025. YEAR PUBLISHED 2024.

improper hygiene allows bacteria to cause UTO

Is E.coli gram positive or negative? - ✔✔gram negative

What is the shape of E.coli? - ✔✔rod

Where is E.coli normally found? - ✔✔human, animals, soil and water

How does E.coli enter the body? - ✔✔ingestion, wound infection or

endogenous spreading



for EPEC there is human to human spread

Where does E.coli multiply in the body? - ✔✔extracellular growth on

intestine, urogenital tract, blood, meninges, etc.



enteroinvasive replicates intracellularly

What are the two groups that E.coli virulence factors can be broken down

to? - ✔✔adhesins and exotoxins

What is ETEC? - ✔✔enterotoxigenic E. coli



traveler's diarrhea, infant diarrhea

, ©NINJANERD 2024/2025. YEAR PUBLISHED 2024.
What are the symptoms of ETEC? - ✔✔watery diarrhea, vomiting, cramps,

nausea and low grade fever

How is ETEC acquired? - ✔✔ingestion of contaminated food or water



NO person to person spread

What is the incubation period for ETEC? - ✔✔1-2 days



watery diarrhea persists for 3-5 days

What is the treatment for ETEC? - ✔✔none, self limiting but given

rehydration therapy



antibiotics used for elderly, pregnant women, immunosuppressed and

young children

What is the mechanism of action of ETEC? - ✔✔1) attaches to microvilli via

colonizing factor adhesin (CFA)



2) CFA a pilus binds to glycoprotein receptor on the surface



3) bacteria releases heat labile toxin (LT-1) and heat stable toxin (STa)

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