Communicable Diseases

2. a viral infection of the respiratory tract
4. The state of being protected against a particular disease
6. A global outbreak of an infectious disease
8. The lining of various body cavities, including the nose, ears, and mouth
10. a viral infection that causes inflammation of the liver
16. A protein that acts against a specific antigen
18. Scarring of the liver
19. A disease outbreak that affects many people in the same place and at the same time
21. Symptoms include sore throat, fever, and enlarged lymph nodes in the neck.
22. A disease that is spread from one living organism to another or through the environment
24. A preparation of dead or weakened pathogens that are introduced into the body to stimulate an immune response

1. Substances that kill cells or interfere with their functions
3. A specialized white blood cell that coordinates and performs many functions of specific immunity
5. a bacterial disease that usually attacks the lungs
7. A piece of genetic material surrounded by a protein coat
9. An organism that carries and transmits pathogens to humans or other animals
11. A reaction to tissue damage caused by injury or infection
12. A microorganism that infects the digestive system
13. A yellowing of the skin and eyes
14. A network of cells, tissues, organs, and chemicals that fights off pathogens
15. Single-celled microorganisms
17. Substances that can trigger an immune response
20. An infection of the lungs in which the air sacs fill with pus and other liquids
23. A condition that occurs when pathogens in the body multiply and damage body cells