Chapter 24 Communicable Diseases

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Across
  1. 3. Pieces of genetic material surrounded by a protein coat.
  2. 5. A substance that kills cells or interferes with their function.
  3. 7. A communicable disease whose incidence in humans has increased within the past two decades or threatens to increase in the near future.
  4. 9. A preparation of dead or weakened pathogens, which are introduced into the body to stimulate an immune response.
  5. 10. The state of being protected against a particular disease.
  6. 11. A specialized white blood cell that coordinates and performs many of the functions of specific immunity.
  7. 12. An organism that causes disease.
Down
  1. 1. An infection of the lungs in which the air sacs fill with pus and other liquid.
  2. 2. Single-celled microorganisms that live almost everywhere on earth.
  3. 4. What occurs when pathogens enter the body, multiply, and damage body cells.
  4. 6. An organism that carries and transmits pathogens to humans or other animals.
  5. 8. A network of cells, tissues, organs, and chemicals that fights off pathogens.