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15 March, 23:04

A key characteristic of pandemic influenzas is that they:

A. Occur in a single wave, then recede quickly

B. Spread slowly throughout specific populations

C. Are not spread through human-to-human contact

D. Have the ability to mutate rapidly

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Answers (1)
  1. 15 March, 23:10
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    The correct option is D

    Explanation:

    A key characteristic of pandemic influenzas is that they have the ability to mutate rapidly. When the immunity of human increases the pandemic virus changes.
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