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Infectious Diseases Overview

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Questions and Answers

What is the role of EAEC pili (AAF) in adherence?

Mediate A/E lesions on the intestinal mucosa

Prevent adherence to the intestinal mucosa

Cause mild adherence to the intestinal mucosa

Mediate tight adherence to the intestinal mucosa (correct)

How is E coli typically diagnosed in culture according to the text?

Blood agar culture

MacConkey agar culture (correct)

Sabouraud agar culture

Chocolate agar culture

What is a disadvantage of using immunoassay and nucleic acid amplification methods for diagnosing intestinal diseases?

Low cost

Limited positive predictive value due to positive results in healthy persons (correct)

Easy availability

High sensitivity and specificity

What is the recommended treatment for acute uncomplicated UTIs due to widespread resistance to earlier agents?

Bactrim (TMP-SMX) and fluoroquinolones Signup and view all the answers

What is usually the treatment approach for most cases of E coli diarrheas?

Rehydration and supportive measures Signup and view all the answers

Which E coli infection can be treated with TMP-SMX or fluoroquinolones to reduce the duration of diarrhea?

ETEC, EIEC, and EPEC infection Signup and view all the answers

What makes sorbitol fermentation useful in detecting EHEC?

Detects the most common EHEC serotype Signup and view all the answers

What do immunoassay and nucleic acid amplification methods aim to detect?

Toxins (LT, ST, Stx) or genes associated with virulence Signup and view all the answers

Which type of antibiotic should be selected based on antimicrobial susceptibility testing of the patient’s isolate?

The antibiotic with the highest resistance rate in the community Signup and view all the answers

In what type of UTI are Bactrim (TMP-SMX) and fluoroquinolones commonly used due to resistance?

Uncomplicated UTIs Signup and view all the answers