Systemic, Minimum Q

Question 1

Which bacteria can be differen ated with the catalase test?

Answer 1

Staphylococci (+) and Streptococci (-)

Question 2

Which bacteria can be differen ated with the coagulase test?

Answer 2

Staphylococcus aureus (+) and the other staphylococcus species (-, so called
„coagulase-nega ve staphylococci”)

Question 3

Microscopic morphology of Staphylococci

Answer 3

Gram-posi ve cocci, arranged in grape-like clusters

Question 4

Colony morphology of Staphylococcus aureus on blood agar plate

Answer 4

round colonies with butt er consistency, golden pigment produc on and beta-
haemolysis

Question 5

What are the non-toxic virulence factors of Staphylococcus aureus? (3 examples)

Answer 5

Protein A, endocoagulase (clumping factor), exocoagulase, adhezins, teicoic
acid, hialuronidase, protease, lipase, DN-ase.

Question 6

What are the toxic virulence factors of Staphylococcus aureus? (3 examples)

Answer 6

Leucocidin, toxic shock syndrome toxin, exfolia ve toxin, enterotoxin,
haemolysin