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What happens in the body when you give a vaccine to which you are already immune?

(1 Post)
Twiglett Sun 27-Mar-05 10:29:26

I know there are scientists / docs on here who can answer that question, and it is something I have been wondering about in terms of my 4 year olds' booster jabs, I would like to understand what happens and whether there's any potential 'overload' to the system

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