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A vaccine is a mild, weakened pathogen, that is almost dead and the body fights the pathogen off by creating antibodies. They are made by lymphodes which can also attack the pathogen (virus,bactirum,protazoa and fungi).

Doctors use them by injecting them into the body. Some forms of vaccine may also be introduced orally (by mouth). Injecting into the muscle is favoured for faster action and prevent the vaccine being destroyed by stomach acids, before the body can react to them.

New vaccines are being produced and perfected all the time. Virus's have a nasty habit of mutating, which render previous vaccines ineffective.

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13y ago

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