Immune System

2. A type of white blood cell that helps kill infected cells or activates other immune cells.
5. A newer type of vaccine that teaches cells to make a protein from the virus to trigger an immune response.
7. Protection from a disease, either after getting sick or from a vaccine.
8. The body’s defense system that fights off infections and diseases.
9. A vaccine made from a weakened form of the pathogen.
10. A type of white blood cell that makes antibodies to attack specific pathogens.
11. A protein made by the immune system that targets and helps destroy pathogens.
12. Special immune cells that remember a pathogen and respond faster if it returns.

1. A microorganism (like a virus or bacteria) that causes disease.
3. When enough people in a population are immune, making it hard for a disease to spread.
4. A substance that trains the immune system to fight a specific pathogen without causing disease.
6. Cells in the immune system that fight infections (includes B cells and T cells).