Bacteria and Viruses

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Across
  1. 3. studies bacteria
  2. 7. body system that fights off disease
  3. 9. single cell organism that can reproduce, can be helpful or harmful.
Down
  1. 1. studies viruses
  2. 2. what a virus is made of
  3. 4. protection from bacteria and viruses, a baby can get this from its mother at birth
  4. 5. not living, injects its DNA into a cell, makes copies of itself, and explodes the cell
  5. 6. used to treat bacterial infections
  6. 8. a shot that can protect us from some viruses and bacteria