It Is Thought That Attenuation Occurs Especially in a Laboratory

question 32

Multiple Choice

It is thought that attenuation occurs especially in a laboratory setting because

• A) nonvirulent or weakly virulent mutants grow faster in laboratory media when there is no selective advantage to virulence.
• B) pathogens lose virulence with age and survive longer in laboratory cultures.
• C) patients can be treated with drugs that induce attenuation.
• D) there is selection for more virulent strains in the laboratory.

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