Across
- 2. The substance in the vaccine that actives the immune system.
- 5. Viruses that cause waves of infections months or years apart.
- 7. Type of immunity achieve by getting infected showing symptoms or not.
- 9. Vaccines protect us from...
- 10. The presence of a disease-causing organism in the body.
Down
- 1. Vaccines that need two doses to protect adequately.
- 3. Process of being resistant to an infectious factor.
- 4. Cells produced by the immune system to protect against infections.
- 6. Immunity that fades away within weeks.
- 8. Type of immunity that lasts longer