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Bacterial Infections and Sources

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Questions and Answers

Which of the following antigens is a classic example of a K antigen?

L antigen

K1 antigen (correct)

H antigen

O antigen

Which Shigella species is associated with postinfectious arthritis in HLA-B27-positive patients?

S.sonnei

S.flexneri

S.dysenteriae (correct)

S.boydii

What is the characteristic of Klebsiella colonies on blood agar?

Slimy

Dry

Mucoid (correct)

Rough

What is the purpose of MacConkey agar in the identification of Enterobacteriaceae?

To differentiate based on lactose fermentation Signup and view all the answers

What is the etiologic agent of typhoid fever?

Salmonella typhi Signup and view all the answers

Which of the following is NOT a characteristic of typhoid fever?

Gastrointestinal symptoms Signup and view all the answers

What is the characteristic of Gram staining reaction in Enterobacteriaceae?

Helpful in speciation Signup and view all the answers

What is the characteristic of the K antigen?

Heat stable Signup and view all the answers

Which of the following media is used to isolate Salmonella species?

XLD agar Signup and view all the answers

What is the characteristic of bipolar staining?

Typical of Salmonella Signup and view all the answers