A the staphylococcus epidermidis organisms are likely

(A) The Staphylococcus epidermidis organisms are likely to
be susceptible to penicillin G.
(B) The Staphylococcus epidermidis organisms are likely to
be resistant to vancomycin.
(C) The Staphylococcus epidermidis organisms are likely to
be in a biofilm on the central venous catheter surface.
(5) Antimicrobial resistance has become a significant
problem. Which one of the following is of major concern
worldwide?
(A) Nafcillin resistance in Staphylococcus aureus
(B) Penicillin resistance in Streptococcus pneumoniae
(C) Penicillin resistance in Neisseria gonorrhoeae

(D) Vancomycin resistance in Staphylococcus aureus
(E) Tobramycin resistance in Escherichia coli
(6) A group of six children younger than 8 years of age
live in a semitropical country. Each of the children has
several crusted weeping skin lesions of impetigo
(pyoderma). The lesions are predominantly on the arms
and faces. Which of the following microorganisms is a
likely cause of the lesions?
(A) Escherichia coli
(B) Chlamydia trachomatis
(C) Staphylococcus aureus
(D) Streptococcus pneumoniae
(E) Bacillus anthracis
7) Which of the following statements regarding the role
of protein A in the pathogenesis of infections caused by
Staphylococcus aureus is correct?
(A) It is responsible for the rash in toxic shock syndrome.
(B) It converts hydrogen peroxide into water and oxygen.
(C) It is a potent enterotoxin.
(D) It is directly responsible for lysis of neutrophils.

(E) It is a bacterial surface protein that binds to the Fc
portion
Answers
1) C
2) C symptoms mentioned in the question are those of toxic
shock syndrome.
3) C
4) C
5) D
6) C
7) E
Sa7wa
1) Which of the following can produce catalase enzyme
(A) enterococci
(B) treptococci pyogens
(C) Staph Epidermidis
(D) candida albican
2) Which of the following is not an antigen of staph
aureus

(A) teichoic acid
(B) capsular polysaccharide
(C) receptor for streptococcal bacteriophage
(D) protein A
3) which of the following is considered a superantigen of
Staphylococci
(A) Haemolysin
(B) Enterotoxin
(C) Hyaluronidases
(D) leucocidine
4) One of the enzymes responsible for formation of
septic metastasis ( spread of infection ) in Staph. aureus
is
(A) coagulase
(B) staphylokinase
(C) beta lactamase
(D) catalase
5) True or False : Staph. epidermidis is novobiocin
sensitive ( )

Answers
1) C
2) C
3) B
4) B
5) True
1) An 8-year-old boy develops a severe sore throat. On
examination, a grayish-white exudate is seen on the
tonsils and pharynx. The differential diagnosis includes
group A streptococcal infection, Epstein-Barr virus
infection, severe adenovirus infection, and diphtheria.
(Neisseria gonorrhoeae pharyngitis would also be
included, but the patient has not been sexually abused.)
The cause of the boy’s pharyngitis is most likely……...
(A) A catalase-negative gram-positive coccus that grows in
chains
II. Streptococci