Actually for those willing to do a little research they will find that Polio was almost completely gone before they brought in a vaccine for it. Various show clearly that Polio rates actually increased when they started vaccinating people.
The United States Centre for Disease Control (CDC) admitted that the vaccine has become the dominant cause of polio in the US today, with 87% of cases between 1973 and 1983 caused by the vaccine. More recently, 1980-1989, every case of polio in the US was caused by the vaccine.
http://www.nccn.net/~wwithin/polio2.htm
Also what is in your vaccine? Most people have no idea there is aborted fetus DNA in various vaccines,
http://articles.mercola.com/sites/ar...sent-form.aspx
There is also Mercury and Aluminium in vaccines too alongside other chemicals known to be deadly to humans. It's a huge topic but watching this film is a great place to start. While the theory of Vaccination sounds good the evidence clearly shows otherwise. Clean water, sufficient food, clean living conditions were the primary reasons for the drastic fall in diseases. Once vaccinations were brought in the CDC's own figures show they increased dramatically.