23: streptococcus vignette - sheet 1 - jonathan

Question 1

What Streptoococci is in
Group A
Group B
Group D

Answer 1

What Groups are the following streptococcus in?
S. pyogenes
S. agalactiae
Enterococcus

Question 2

What is the gram status and linking of
Group A Strep. pyogenes
Group B Strep. agalactiae
Group D Enterococcus
Viridans Streptococci
S. pneumoniae aka pnuemococci

Answer 2

All G+ in chains, except

S. pneumoniae pnuemococci is LANCET shaped DIPLOCOCCI

Question 3

What strep are hemolytic
BETA
ALPHA, BETA, GAMMA
ALPHA GAMMA

Answer 3

BETA: Group A Strep Pyogenes and Group B Strep. agalactiae
ALPHA, BETA, GAMMA: Enterococci
ALPHA GAMMA: Viridans streptococci and S. pneumoniae Pneumococci

Question 4

Of the BETA hemolytic, which strep is BACITRACIN sensitive vs resistant?

Answer 4

beta and bacitricin SENSITIVE Group A S. pyogenes

beta and bacitricin RESISTANT Group B S. agalactiae

Question 5

Of the ALPHA GAMMA hemolytic, which strep is OPTOCHIN sensitive vs resistant?

Answer 5

alpha gamma optochin SENSITIVE S. pneumococci

alpha gamma optochin RESISTANT Viridans streptococci and enterococcus

Question 6

On what tissues are Strep found
Group A Strep. pyogenes
Group B Strep. agalactiae
Group D Enterococcus
Viridans Streptococci
S. pneumoniae aka pnuemococci

Answer 6

1) skin and oral pharynx
2) vagina and colon
3) colon
4) oral
5) oral pharynx

Question 7

What is the virulence factor of
Group A Strep pyogenes
S. pneumococcus

Answer 7

1) M protein and capsule

2) Capsule, pneumolysin, IgA, protease

Question 8

What types of infections are caused by
Group A Strep. pyogenes
Group B Strep. agalactiae
Group D Enterococcus
Viridans Streptococci
S. pneumoniae aka pnuemococci

Answer 8

1) skin infections, pharyngitis, necrotizing fascitis, AGN, RHEUMATIC FEVER
2) neonatal sepsis and meningitis
3) UTI, sepsis and endocarditis, especially in the ederly and weak immune response
4) endocarditis
5) Otitis media (children), pneumonia, sepsis, meningitis (ederly)

Question 9

What is the Tx for
Group A Strep. pyogenes
Group B Strep. agalactiae
Group D Enterococcus
Viridans Streptococci
S. pneumoniae aka pnuemococci

Answer 9

1) Penicilin
2) Penicilin or Ampicilin
3) RESISTANT, sometimes even to vancomycin
4) Penicilin
5) RESISTANT sometimes to penicilin and erythromycin

Question 10

What is Px for
Group B Strep. agalactiae
S. pneumoniae aka pnuemococci

Answer 10

2) Tx mother with penicilin before delivery

5) pneumococcal vaccines