Structure and substances that may enhance the virulence or invasiveness of a bacterium include
A. the capsule
B. hyaluronidase
C. M protein
D. coagulase
E. all of the above
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Which statement is true about an exotoxin?
A. It is commonly produced by gram negative bacteria
B. Its 50% lethal dose may be as low as the picogram level
C. It is composed primarily of carbohydrate
D. It is LPS associated
E. It is heat stable
Biological products commonly used for passive immunity are
A. killed bacterial cells
B. the vaccine
C. BCG
D. toxoid
E. antitoxin
The pathogenicity of bacteria mainly depends on bacterial
A. basic and special structures
B. catabolites
C. invasiveness and toxins
D. ways to invade the body
E. number of invading bacteria
Which of the following statements about lipopolysaccharide is correct?
A. It interacts with macrophages and monocytes yielding release of cytokines
B. The toxic component is the O side chain
C. It forms holes in red blood cell membranes yielding hemolysis
D. It causes hypothermia
E. It causes paralysis
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