Vaccine production. View of syringe above several rows of eggs illustrating the concept of vaccine production. A single egg glows red indicating inoculation. Vaccine production often involves the use of embryonated hens' eggs. These are eggs which have a developing foetus inside. A virus will be introduced into the egg via a syringe. There it will be allowed to multiply inside the foetus. After a given period of time the viruses are removed and chemically modified or killed. They can then be safely introduced into a human body. This will stimulate the body into developing a defence to future attack by that virus.
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