Yay

3. Introducing a pathogen or antigen into the body to stimulate immunity
4. A widespread eruption of skin lesions, a symptom of smallpox.
7. A widespread occurrence of a disease in a community at a particular time.
9. Complete elimination of a disease from the world.
11. Resistance to a particular infection or toxin due to the presence of specific antibodies.
12. An outbreak of a disease that affects a large geographic area, often worldwide.

1. Easily spread from person to person.
2. A biological preparation that provides active acquired immunity to a particular disease.
5. Abnormal changes in body tissue caused by disease or injury.
6. Isolation to prevent the spread of disease.
8. A woman who traditionally worked closely with cows and was key to Jenner's smallpox vaccine discovery.
10. The scientist known for developing the first smallpox vaccine using cowpox virus.