[Sephiroth]

Originally Posted by Damien

Yeah, as I understand it the symptoms of flu (and most things) are your body fighting the virus. I believe that's why there is a latency period for viral infections - the virus is replicating but your body hasn't started fighting it yet.

But you don't have the live virus in the vaccine. As Pierre says it's possible to get the symptoms of flu but this isn't your body responding to the flu virus but the vaccine itself. I don't know why that would only happen with the flu vaccine and not the others but I guess that depends on the chemistry of the vaccine....

... or the behaviour of my immune system. It's the 3/3 that removes the "may be"s.