When the immunologist says that pathogens possess virulence, what does virulence mean?
a. Spreads from one individual to others and causes disease.
b. Induces an immune response.
c. Causes disease.
d. Damages tissue.
ANS: C
Virulence is the capacity of a pathogen to cause severe disease—for example, measles virus is of low virulence; rabies virus is highly virulent. Communication is the ability to spread from one in-dividual to others and cause disease. Immunogenicity is the ability of pathogens to induce an immune response. Damaging tissues is the pathogen's mechanism of action.
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