You’re wrong...Polio had increased from the 1940s by leaps and bounds before the Salk vaccine came out.
You are somewhat correct, but the vaccine was introduced in 1957, by 1955 cases were already dropping drastically. You don’t want to take another look at all of the vaccines? With record amounts of Cancer, and autism in the US, you aren’t just a bit curious? There was SV40 virus in the early vaccines, which is a known cause of cancer. They use “immortal cell lines” in the making of vaccines, which is essentially what cancer is, a cell that is nearly impossible to cure. 1 in 2 men will get cancer in the US, 1 in 4 women. Overall, the ratee is 1 out of every 3. Scientists tell us that people died much younger, in the early 20th century, and cancer is more prevalent as you age. The stats are skewed, if they used only children whe lived to age 12 in the studies, and eliminate women who died in childbirth, people lived just about as long as we do now. I knew a lot of people who lived into their late 90’s, who were born in the late 1800’s. Something is different, Cancer is an epidemic. We need too find out what is causing it.