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Why does immunisation against one disease not protect you against another?
Wiki User
∙ 12y ago
Because the vaccine is made from the microorganisms of a particular disease, and that's the one against which you are protected.
Immunization occurs when the immune system of the body has developed antibodies to fight the disease. The antibodies are proteins that have a special section called a paratrope that is tailored to fit exactly with part of the virus or bacteria it is designed to combat - like a lock and key. Once it attaches to the virus or bacteria it either renders it inactive or acts as a tag for other immune system components to attack. The structure the antibody attaches to is specific to the disease - other diseases will usually have different structures so the antibody cannot fit exactly to them and bind. Sometimes related diseases will share a similar structure so that immunizing against one disease will protect against another - for example cow pox was used as a vaccine to help people develop immunity against the different forms of smallpox.
Wiki User
∙ 12y ago
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