Pathogen - virus, bacteria, or microorganism that causes disease, white blood cell - cells that can identify pathogens, kill pathogens by eating them or with chemicals, tag pathogens to be killed by other cells, and make antibodies, antigen - a protein on the surface of a pathogen that an antibody can bind to, antibody - a protein made by white blood cells to fight a specific antigen, vaccine - injection contain a dead or weakened virus to build an immune response against it (prevents diseases), antibiotic - medication that can kill bacteria after infection (cures diseases), immune system - The cells and tissues that recognize and attack foreign substances in the body,

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