How do viruses jump from animals to humans?

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Across
  1. 5. achieve or complete successfully.
  2. 6. the action or process of adapting or being adapted.
  3. 8. having or showing the symptoms of a fever.
  4. 9. change in form or nature.
  5. 10. lack of success.
Down
  1. 1. proportion
  2. 2. likely or liable to be influenced or harmed by a particular thing.
  3. 3. red or swollen as a result of inflammation.
  4. 4. an organism that lives in or on an organism of another species
  5. 7. identify the nature of (an illness or other problem)