The top one is American, and links into other websites that have the specific info you want (found easily on the sidebar - some more biased than others), the second is from the NHS. The NHS, in Britain, is not the most impartial or even caring of institutions, and is VERY pro-vaccine, but does give some information that you can use. Beware of the bias creeping into every page though. I have been given injections by the NHS after refusing them (as an adult); in many cases they value "looking after you" more than caring for you.
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