Enough reason to cause concern, I would think.
It has been in wide use for 5 years now, with millions of doses given - if the kind of adverse reactions you posted were common, it should be easy to find thousands and thousands of examples by now, wouldn't you think?
All of which is beside the point, which is there was NOTHING dishonest or shrill about what Bachmann asserted, anything to the contrary said here notwithstanding. It is a legitimate issue for anyone who is concerned about governmental overreach.
Period.