Jason Crawford on X: "@Bapitts @davidasinclair @CalvinAyre @salkinstitute No, the epidemics were actually getting worse. The peak year for polio cases in the US was 1952, just a few years before the
![Plot of the number of polio cases in US from January 1970 to December... | Download Scientific Diagram Plot of the number of polio cases in US from January 1970 to December... | Download Scientific Diagram](https://www.researchgate.net/publication/322965561/figure/fig3/AS:591208225189888@1517966433099/Plot-of-the-number-of-polio-cases-in-US-from-January-1970-to-December-1983.png)
Plot of the number of polio cases in US from January 1970 to December... | Download Scientific Diagram
![Jason Crawford on X: "@Bapitts @davidasinclair @CalvinAyre @salkinstitute No, the epidemics were actually getting worse. The peak year for polio cases in the US was 1952, just a few years before the Jason Crawford on X: "@Bapitts @davidasinclair @CalvinAyre @salkinstitute No, the epidemics were actually getting worse. The peak year for polio cases in the US was 1952, just a few years before the](https://pbs.twimg.com/media/EVaBrA1U0AExlSN.jpg)
Jason Crawford on X: "@Bapitts @davidasinclair @CalvinAyre @salkinstitute No, the epidemics were actually getting worse. The peak year for polio cases in the US was 1952, just a few years before the
![First U.S. Polio Case in Nearly a Decade Highlights the Importance of Vaccination - Scientific American First U.S. Polio Case in Nearly a Decade Highlights the Importance of Vaccination - Scientific American](https://static.scientificamerican.com/sciam/cache/file/3F657A2D-DBF0-4149-858E98677B173F66.jpg)
First U.S. Polio Case in Nearly a Decade Highlights the Importance of Vaccination - Scientific American
![Lessons from how the polio vaccine went from the lab to the public that Americans can learn from today Lessons from how the polio vaccine went from the lab to the public that Americans can learn from today](https://scx1.b-cdn.net/csz/news/800a/2020/5f620e47e5bad.jpg)
Lessons from how the polio vaccine went from the lab to the public that Americans can learn from today
![Annual poliomyelitis case rate in U.S. States reporting both cases and... | Download Scientific Diagram Annual poliomyelitis case rate in U.S. States reporting both cases and... | Download Scientific Diagram](https://www.researchgate.net/publication/278382620/figure/fig5/AS:364276662456324@1463861732935/Annual-poliomyelitis-case-rate-in-US-States-reporting-both-cases-and-deaths-From-1910.png)