There is a fund in America used to protect pharmaceutical companies against litigation dealing with faulty or dangerous vaccines. They pay off people so they can not damage the "good" name of these companies. Due to this protection most people have no idea the negative effects of vaccines. A lot of vaccines have the danger of coming down with the same disease because of the use of live viruses in the vaccine. Here is an example:

Polio surge in Nigeria after vaccine virus mutates

LONDON – Polio, the dreaded paralyzing disease stamped out in the industrialized world, is spreading in Nigeria. And health officials say in some cases, it's caused by the vaccine used to fight it.

In July, the World Health Organization issued a warning that this vaccine-spread virus might extend beyond Africa. So far, 124 Nigerian children have been paralyzed this year — about twice those afflicted in 2008.

The polio problem is just the latest challenge to global health authorities trying to convince wary citizens that vaccines can save them from dreaded disease. For years, myths have abounded about vaccines — that they were the Western world's plan to sterilize Africans or give them AIDS. The sad polio reality fuels misguided fears and underscores the challenges authorities face using a flawed vaccine.

Nigeria and most other poor nations use an oral polio vaccine because it's cheaper, easier, and protects entire communities.

But it is made from a live polio virus — albeit weakened — which carries a small risk of causing polio for every million or so doses given. In even rarer instances, the virus in the vaccine can mutate into a deadlier version that ignites new outbreaks. Read entire article