Which antibiotic should be preferred to treat the infection of streptococci? ()
A. strptomycin
B. penicillin
C. metronidazole
D. erythromycin
E. none of the above
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Staphylococcus aureus has been linked to all of the following conditions EXCEPT ()
A. scalded skin syndrome
B. toxic shock syndromes
C. boils and pimples
D. scarlet fever
E. none of the above
Which enzyme is not produced by group A streptococcus ()
A. hyaluronidase
B. coagulase
C. streptokinase
D. streptodornase
E. none of the above
All of the followings are main antigens of enteric bacilli except ()
A. O antigen
B. H antigen
C. capsular antigen
D. spore antigen
E. none of the above
Infantile diarrhea and traveler’s diarrhea are commonly caused by ()
A. Escherichia coli
B. Treponema pallidum
Clostridium botulinum
D. Listeria monocytogenes
E. none of the above
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