Why do some people have bad reactions to flu jabs?

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martin symons

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martin symons asked the Naked Scientists:
   
Why do some people have bad reactions to flu jabs...? (The reactions are as if they have contracted the flu virus).

What do you think?

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Offline PhysBang

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Why do some people have bad reactions to flu jabs?
« Reply #1 on: 11/12/2009 13:48:01 »
I can think of a few reasons off the top of my head:

they have an immune response to the vaccine that goes beyond that of normal people and triggers symptoms

they have an immune response to a substance in the jab (perhaps an allergy response)

the placebo effect

they actually caught a cold or the flu at the same time as they got the jab (this has to happen in quite a few cases, given the number of people who get vaccinated and the number of people who get colds and flus)