| HIV | Causes AIDS, Human Deficiency Virus. |
| complement | a substance that destroys cells that have affected viruses. |
| immune system | system your body uses to defend itself against viruses and simple organisms. |
| interferon | prevents viruses from spreading or tumors growing. |
| smallpox | pus-filled sores and dangerous high fever . |
| vaccine | a substance that sets up your immune system to produce antibodies. |
| virus | A particle made up of hereditary material and protein that produces within a living cell. |
| white blood cell | cell found in the bloodstream that destroys microorganisms or substances that aren't part of the body. |
Drag corresponding items onto each other to make them disappear.
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