Polio went from a disease with 350,000 annual cases 30 years ago, to just 22 new cases in 2017. This decline is thanks to massive worldwide effort to vaccinate children against the disease in developing regions.
Polio went from a disease with 350,000 annual cases 30 years ago, to just 22 new cases in 2017. This decline is thanks to massive worldwide effort to vaccinate children against the disease in developing regions.
