Can i throw a spanner in the works here...
Now i have NO facts on what I'm about to say but it's something that has been bugging me...
We all know about the swineflu and birdflu issues which have been in the news recently and over the years...
Could we be opening ourselves up to animal diseases because we are now injecting ourselves with vacines that have been processed using animal proteins/parts...

Is our DNA/RNA being damaged/mutating/splicing and joining with the DNA/RNA of animals used in the vaccines and hence putting us at risk to these "new" viruses from animals?

Just food for thought?