This is true, the shot has mercury in it, but why didn't we know about it until now? I mean, supposedly all of the flu shots of about the past 15 years or so have had mercury in them, but we are just learning about it now. Mercury not only can cause MS, but it also has damaging effects on the nervous system, and can cause irreversable brain damage. Autisim has also been thought to have possibly come from mercury.