Influenza vaccines, also known as flu shots or jabs, are vaccines that protect against influenza. The vaccines are generally safe. In children, fever occurs in five to ten per cent, as may muscle pains or feeling tired. It should not be given to those with severe allergies to eggs or to previous versions of the vaccine. The vaccines come in both inactive and weakened viral forms. The inactive version should be used for those who are pregnant. They come in forms that are injected into a muscle, sprayed into the nose, or injected into the middle layer of the skin.
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