| A | B |
|---|
| pathogen | a microorganism, another organism, a virus, or a protein that causes disease |
| B cell | a white blood cell that makes antibodies |
| antibody | a protein made by B cells that binds to a specific antigen |
| T cell | an immune system cell that coordinates the immune system and attacks many infected cells |
| vaccine | a substance that is prepared from killed or weakened pathogens or from genetic material and that is introduced into a body to produce immunity |
| macrophage | an immune system cell that engulfs pathogens and other materials |
| immunity | the ability to resist or recover from an infectious disease |
| immune system | the cells and tissues that recognize and attack foreign substances in the body |
