A Vaccine Trial Puzzle

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Across
  1. 4. How The Coronavirus _________ Will Go from the Lab to your Arm
  2. 6. During the fourth phase, researchers test the vaccine on __ ____ ___ ______. (four words)
Down
  1. 1. During the last phase, the vaccine is given to the ________.
  2. 2. During the third phase, researchers test the vaccine on a small number of ________… carefully.
  3. 3. During the second phase, researchers test the vaccine on ___________.
  4. 5. During the first phase, researchers _______ a vaccine.