Multiple choice

Clinical trials for vaccines contain _________ phase/s.

  1. one

  2. two

  3. three

  4. four
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Vaccine clinical trials follow the standard three-phase system: Phase I tests safety and immunogenicity in small groups, Phase II assesses immune response and safety in larger groups, and Phase III confirms efficacy in thousands of subjects. Some vaccines may have Phase IV for post-marketing surveillance.

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