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Shigella Infection: Transmission and Clinical Presentation

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Shigella Infection: Transmission and Clinical Presentation

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Questions and Answers

What is the purpose of the lysine decarboxylase test in differentiating between Shigella and E. coli?

To separate the two species based on their metabolic properties (correct)

To determine the presence of Shiga toxin

To identify the virulence factors of E. coli

To distinguish between motile and non-motile bacteria

Which of the following is a characteristic of Shigella that distinguishes it from E. coli?

Production of Shiga toxin

Non-motility (correct)

Indole production

Motility

What is the primary mode of transmission of EHEC?

Airborne transmission

Contaminated food and water (correct)

Vector-borne transmission

Direct contact with infected individuals

What is the primary complication of Shiga-toxin infections?

Haemolytic ureamic syndrome (HUS) Signup and view all the answers

Which of the following E. coli strains is commonly associated with traveler's diarrhea?

ETEC Signup and view all the answers

What is the primary mechanism of action of Shiga toxin?

Inhibition of protein synthesis Signup and view all the answers

What is the primary mechanism by which Shigella species breach the mucus layer in the gut?

By producing enzymes that break down mucus Signup and view all the answers

What is the typical duration of a self-limiting Shigella infection?

Less than 10 days Signup and view all the answers

What is a characteristic symptom of Shigella infection?

Mucus and blood in stool Signup and view all the answers

Why is antibiotic treatment necessary for Shigella infections?

To reduce the risk of encephalopathy Signup and view all the answers

What is a key challenge in distinguishing Shigella from E. coli in the laboratory?

Neither produces H2S gas Signup and view all the answers