Antigens  - Unique proteins found on the surface of cells, Natural immunity  - When a person becomes infected naturally by a disease and the body builds natural immunity , Vaccine induced immunity - Use a weakened or dead form of a disease to stimulate an immune response , Antibodies - Unique proteins that your immune system makes to help fight infection , White blood cells - Recognise foreign antigens and start the process of destroying the cell by producing antibdies, What do vaccines do? - They protect you against certain diseases e.g. Measles, Mumps, Rubella, Covid, Vaccine disadvantages  - Bad reactions, side effects, defects, Vaccine advantages   - More immunity, less deaths from horrible and deadly diseases,

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