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Methods for Identification of Etiological Agents of Infectious Disease: Staphylococcus

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Questions and Answers

Which test is used to differentiate between Staphylococcus aureus and other staphylococci?

Coagulase test (correct)
Antibiotic sensitivity test
Novobiocin susceptibility test
Bile susceptibility test

What is the purpose of the Bile Esculin Agar (BEA) plate in the text?

To test for the presence of coagulase
To differentiate Staphylococcus aureus from Enterococcus faecium (correct)
To test for the presence of heat-stable nuclease
To test for antibiotic sensitivity

Which characteristic of Enterococcus is mentioned in the text?

It requires media enriched with blood for growth
It grows in the presence of 6.5% NaCl and 40% bile at 45C (correct)
It is motile and spore-forming
It has a hyaluronic acid capsule

What is the purpose of the Novobiocin susceptibility test (NST) mentioned in the text?

To differentiate between Staphylococcus saprophyticus and other coagulase-negative staphylococci (A) Signup and view all the answers

Which of the following is a characteristic of Streptococcus pyogenes mentioned in the text?

It requires media enriched with blood for growth (A) Signup and view all the answers

What is the most significant consequence of Streptococcus entering the bloodstream according to the text?

It can cause a continuous bacteremia and lead to infective endocarditis (B) Signup and view all the answers

What is the primary purpose of obtaining multiple blood cultures according to the text?

To identify the specific bacteria causing the infection (B) Signup and view all the answers

What is the primary function of the anticoagulant in the blood culture media mentioned in the text?

To prevent the bactericidal effect of human serum (B) Signup and view all the answers

What is the ideal ratio of blood to culture medium mentioned in the text?

1:10 (A) Signup and view all the answers

Which type of bacteremia is most likely to be associated with an intravascular source of infection according to the text?

Continuous bacteremia (B) Signup and view all the answers

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