Cocci

Question 1

what are the virulence factors of Staph. Aureus?

Answer 1

Capsule, Protein A, and Coagulase

Question 2

what toxins does Staph Aureus produce?

Answer 2

Enterotoxin, Leukocidin, Exfoliatin, TSS toxin (superantigen) and DNase

Question 3

what are the virulence factors of S. pneumoniae (pneumococci)?

Answer 3

No toxins only Capsule, polysaccharide antigen which produces weak antibody

Question 4

alpha hemolytic streptococci are

Answer 4

S.Pneumoniae and Viridans Streptococci

Question 5

beta-hemolytic streptococci are

Answer 5

Group A Streptococci (S.pyogenes) and Group B Streptococci

Question 6

gamma-hemolytic streptococci are

Answer 6

E.faecalis and S.bovis

Question 7

what’s the virulence factor of Viridans streptococci

Answer 7

sugar metabolizing enzymes which turn low m.wt sugar to high m.wt sugar

Question 8

what are the toxins of Group A Streptococci

Answer 8

Streptokinase, Streptodornase, hyaluronidase, pyrogenic toxin and erythrogenic toxin

Question 9

what are the virulence factors of Group A streptococci

Answer 9

Pili, encoded by a pathogenicity island, and M protein

Question 10

what are the virulence factors of Group B streptococci

Answer 10

Capsule which is not very virulent

Question 11

what’s the reservoir of Group B Streptococci and what do they cause?

Answer 11

Genital tract of 25% of women, cause neonatal meningitis and sepsis