Medical Microbiology: Bacterial Classification Lecture 1

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Which of the following staphylococci is often termed 'coagulase negative staphylococci'?

S. epidermidis (correct)

S. saprophyticus

S. aureus

S. xylosus

What method is used to demonstrate the presence of coagulase in staphylococci by mixing plasma with a suspension of bacteria?

DNase production test

Slide coagulase test

Protein A detection test

Tube coagulase test (correct)

Which enzyme is possessed by S. aureus but rarely by other staphylococci?

DNase (correct)

Coagulase

Hemolysin

Protein A

What characteristic is used for differentiating between S. saprophyticus and S. epidermidis?

Novobiocin sensitivity Signup and view all the answers

Which staphylococcus possesses a cell-wall antigen known as protein A?

S. aureus Signup and view all the answers

What test is a more rapid and simple method for detecting the presence of coagulase in staphylococci?

Slide coagulase test Signup and view all the answers

Which body part is MOST commonly colonized by S. aureus in healthy adults?

Axilla Signup and view all the answers

What is the Gram staining characteristic of S. aureus when observed under the microscope?

Gram-positive cocci in clusters Signup and view all the answers

Which enzyme produced by S. aureus interferes with phagocytosis and enhances tissue invasion?

Coagulase Signup and view all the answers

What is the function of MSCRAMMs in S. aureus?

Cell adhesion to host cells Signup and view all the answers

Which biochemical test is NOT typically used for full identification of S. aureus?

Oxidase test Signup and view all the answers

What is the primary route of spread for S. aureus according to the text?

Droplets and skin scales Signup and view all the answers

Which characteristic is used to further divide medically important bacteria into groups besides cell shape and staining reactions?

Motility Signup and view all the answers

Which of the following is a Gram-positive bacterium that is usually associated with humans and is considered clinically important?

Staphylococcus aureus Signup and view all the answers

What is the colonial morphology of Staphylococcus saprophyticus like?

White Signup and view all the answers

Which of the following characteristics is NOT true of Staphylococci?

Sporing Signup and view all the answers

What is the optimum temperature for the growth of Staphylococci?

37°C Signup and view all the answers

In what kind of media do Staphylococci typically grow?

Simple media Signup and view all the answers