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, Macrophage - destroys pathogens by engulfing them, Killer T cells - attack infected body cells by attaching to specific antigens., B cells - make antibodies that attach to specific antigens., Helper T cells - activate other T cells., Auto Immune Disease - immune system attacks the body’s own cells, Immune Deficiency - immune system sometimes fails to develop properly or becomes weakened, Allergies - immune system reacts to foreign antigens that are not dangerous to most people, Inflammation - swelling and redness , Integumentary system - Skin,

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