Which enzyme is not produced by group A streptococcus ()
A. hyaluronidase
B. coagulase
C. streptokinase
D. streptodornase
E. none of the above
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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
"Shigellosis is common in travelers to developing countries. Infection is commonly acquired through the" ()
A. Skin
B. Gastrointestinal tract
C. Respiratory tract
D. Genital tract
E. none of the above
Virulence factors of Vibrio cholera exclude ()
A. flagella
B. pili
C. exotoxin
D. endotoxin
E. none of the above
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