The antibody that develops after an episode of pneumococcal pneumonia may not protect against subsequent pneumococcal disease because()
A. the antibody is only against the pneumococcal C carohydrate
B. antibody are present in the serum for only a few days
C. the polysaccharide is not immunogenic
D. the 84 different pneumococcal polysaccharides and their antibodies do not cross-protect
E. none of the above
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The antibiotic of choice for pneumococcal pneumonia is()
A. Penicillin
B. Ampicillin
C. Erythromycin
D. Vancomycin
E. none of the above
Which of the following is most often associated with bacterial dysentery? ()
A. Vibrio cholerae
B. shigella
C. Salmonella enteriditis
D. species of the genus clostridium
E. none of the above
Vibrio cholera attaching to intestinal surface is due to ()
A. flagella
B. pili
C. LTA
D. K antigen
E. none of the above
Which is the pathogenesis of tetanus? ()
A. causing septicemia
B. causing endotoxin shock
C. hemolysin invade central nervous system and cause disease
D. tetanospasmin spread along central nervous system
E. none of the above
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