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Message: <blockquote data-quote="KathrynB" data-source="post: 642149" data-attributes="member: 22378">Although the flu jab contains weakened virus or proteins with the virus particles removed, you can't catch flu from it. The jab fools the immune system into thinking it's been invaded in order for it to make antibodies against flu which will be ready to act if you come into contact with the virus at a later date. When people feel ill after the jab it's the body's immune response that causes the ill feelings. The human immune response is immensely complex and involves many cells,chemicals and messengers and when we are ill, the horrible feelings are mostly due to the immune response which is necessary to kill the invader.Lots of people can have the flu jab with no side effects. Some (including me) normally have no side effects but occasionally feel rotten for a few days after. I tell myself my immune response must be really good if I feel bad! That's not to say the effect of the vaccine isn't as good if you don't feel ill afterwards</blockquote>

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