Which of the Following Is the Primary Reason That Live

question 12

Multiple Choice

Which of the following is the primary reason that live attenuated vaccines so difficult to develop?

• A) Viruses do not mutate very quickly.
• B) Viruses replicate very quickly.
• C) The mutations that determine attenuation can not be predicted.
• D) Not all pathogenic viruses can be grown in culture.
• E) It is difficult to maintain the stability of attenuated viruses.

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