IGCSE Review- Immunity

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Across
  1. 3. An injection of weakened or dead pathogen
  2. 5. A drug used to kill bacteria
Down
  1. 1. Long term protection when the body makes its own antibodies and memory cells
  2. 2. A molecule on the surface of pathogens that trigger an immune response
  3. 4. A protein produced by lymphocytes that binds specifically to (3)