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Vaccinations are injected into the muscle to slow down its distribution to the body's tissues. If it were administered directly in a vein, it would reach every part of the body much too quickly and thus has the potential to incite an overly strong immune response. By placing it in the muscle, only small amounts of the vaccine are transferred into the blood stream at a time, dampening the immune response. The purpose of a vaccine is to develop antibodies against a particular antigen (usually viruses) so that your body can fight it off if exposed to it in the future. You don't actually need a full blown immune response to do this, just development of the correct immune cells. So by injecting into the muscle instead of a vein, you are saving yourself from pain, inflammation, or even shock.

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12y ago

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