| A | B |
|---|
| Pathogen | An organism, a virus, or a protein that causes disease. |
| Immune System | Made up of tissues and specialized white blood cells that recognize and attack foreign substances in the body. |
| Antibody | A specialized protein that binds to a specific antigen to tag it for destruction. |
| Antigen | A substance that stimulates a response by the immune system. |
| Immunity | The ability to resist or recover from an infectious disease. |
| Vaccine | A substance prepared from killed or weakened ahtogens that is introduced into the body to produce immunity. |
| Infectious Disease | A disease caused by a pathogen. |
| Noninfectious Disease | Diseases that are caused by heredity or environmental factors. |
| Virus | Tiny particles that contain their own genetic material, but depend on living things to reproduce. |
| Bacteria | Single celled prokaryotes that can be round, rod, or spiral shaped. Can be both pathogenic and beneficial. |
| Antibiotic | A medicine used to kill or slow the growth of bacteria and other microorganisms, such as fungi. |
| Antiviral Drug | A drug that destroys viruses or prevents their replication. |
| Prion | A misfolded protein able to produce a disease in organisms that consume it. |
