WHY DO WE FALL ILL? Let's Play a Crossword!

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Across
  1. 3. The vector of this disease is mosquito
  2. 7. The condition of common worms in children's gut
  3. 9. The defense system of our body
Down
  1. 1. The process of developing the immunity through the exposure with a dead or weakened pathogen
  2. 2. It is caused by a bacteria
  3. 4. Long term and serious form of disease
  4. 5. It is caused by a protozoa
  5. 6. It is caused by a virus
  6. 7. Short term and mild form of disease
  7. 8. The chemical drug that works to stop/block certain specific biochemical process among the pathogen