The action mechanism of `diphtheria toxin is ___:
A. Increase cAMP level;
Break ribosome;
C. inactivate EF-2 to block protein synthesis;
D. Cause damage to ciliated cells of respiratory tract;
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Which one of the following statements about diphtheria bacilli is not correct:
All corynebacteria diphtheria can cause disease
B. It has granules on its terminals;
C. It can form black colony in tellurites blood agar plate;
D. Administration of toxoid of diphtheria toxin can prevent disease.
Which statement is right about entry route of diphtheria bacilli ?
A. fecal - oral route;
B. respiratory route;
C. sexual contact
D. blood transfusion
Which is right about gene location of diphtheria toxin ?
A. It is in a virulent plasmid;
B. It is in the transposon;
C. It is in a R plasmid
D. It is in the prophage;
Which systemic infection of diphtheria bacilli may cause heart failure?
A. toxemia
B. septicemia
C. endotoxemia
D. bacteriemia
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