Vaccines

3. A response of the body to resist familiar and specific diseases
5. A condition in which a disease can be easily spread from one person to another
6. The body's ability to resist or fight off sickness
8. A condition where a disease spreads quickly and widely
9. A microorganism that can cause illness or infection
11. A disease caused by the variola virus, characterized by fever and a distinctive rash

1. A practice of isolating individuals who may have been exposed to a contagious disease
2. A sudden rise in the incidence of a disease within a specific community or region
4. A weakened version of a sickness used to stimulate the immune system
6. A system in the body that protects against sickness and disease
7. Tiny organisms that can cause sickness or disease
10. A mild illness affecting cows, which can provide immunity against smallpox in humans