Max 10% adverse affects reports, FDA says it, it's very well known, this is because it's a passive reporting system, also problems with vaccines can happen months afterwards, so most won't pick up on it, mid/long-term studies would be required, studies which won't be funded for obvious reasons.
http://www.gao.gov/new.items/he00053t.pdf
Polio, now let's take a look at what's Bill Gates has been up to in India
Indian J Med Ethics. 2012 Apr-Jun;9(2):114-7.
Researchers reported
"?while India has been polio-free for a year, there has been a huge increase in non-polio acute flaccid paralysis (NPAFP). In 2011, there were an extra 47,500 new cases of NPAFP. Clinically indistinguishable from polio paralysis but twice as deadly, the incidence of NPAFP was directly proportional to doses of oral polio received. Though this data was collected within the polio surveillance system, it was not investigated. The principle of primum-non-nocere [First, do no harm] was violated."
We have to stop pretending that there's no money in vaccines and the diseases they bring, this is not one big charity for the good of mankind. There are conflicts of interest all around Big Pharma, we can't be naive about this, they have revolving doors with the CDC, it's a self-regulating industry. They have money driven people at the top, money is their priority, they make money from making us sick and treating the symptoms. This is why giving them access to our bodies by allowing vaccines gives them a temptation which is difficult for them to resist, if they start up Diabetes Type 1, MS etc then their profits explode.
Many pharma studies have manipulated conclusions, they avoid comparing unvaccinated children against vaccinated, they don't use proper controls in the study i.e. a real control would be an unvaccinated person, but instead they give a person a 'Substance Vaccine', which means all the toxic stuff without the virus. This is madness! If someone dies in the study, they remove them from the study, put it down as coincidence. Independent research is rare, it's effectively like McDonalds researching the health benefits and dangers of their own food, they would not be the best people to be left in charge of the research.
Money has corrupted the Pharmaceuticals, the trust is gone, it's now a criminal industry which makes money from poisoning us and then treating our symptoms.