Polio had already been reduced by 60% from the early 1900's and was in a STEEP decline prior to vaccine introduction. Many health professionals say improvements in sanitation was the MAIN reason for the decline. Furthermore, many of the Polio cases occurred on rural Farms (cows) and were the last to receive such sanitation improvements.
If you would like to watch a short 45 minute video that reviews these numbers and charts for various vaccines/diseases, here you go:
http://video.google.com/videoplay?docid=-6696666502913965744&ei=QOruStO8Ate2-AaboLmgCg&q=vaccines+the+hidden+truth# Lastly, if one looks at ANY data put out by the CDC or Vaccine pushers they WILL NOT show you data from 1900's -1950. They will only show vaccine data/charts for 10 years prior to the vaccine and then years following the vaccine. They HIDE and DECEIVE the truth by not showing ALL the data since 1900, prior to introduction of the vaccine. Just like they do with Global Warming numbers.
Do you know what the CDC calls people who question vaccines? Anti-vaccine publications. LOL. anti, anti, anti, anti. I am actually surprised they do not call us "anti-health".
In my personal opinion, I see many of the same types of wording, lies and deceptions in the Vaccine Industry as I do in all the other areas we already know Jews lie about.