rwardin's linked article attempts to dodge clear evidence that the polic vaccine has virtually eliminated the disease (and its consequences of paralysis and death) in most parts of the world. It claims instead that the disease still exists in the form of aseptic meningitis.
Wrong, wrong, wrong.
In the first place, aseptic meningitis (inflammation of the membranes covering the brain and spinal cord) is due to identifiable pathogens which include other types of viruses, fungi and occasionally TB. We know what causes it, and it is no longer polio.
"The most common causes of viral meningitis are the enteroviruses, herpesviruses, and HIV...Among viruses, enteroviruses are the most common cause of aseptic meningitis. These are small, nonenveloped RNA viruses of the picornavirus family with various serotypes. More than 50 subtypes have been linked with meningitis.
By the way - in addition to stopping aseptic meningitis cases that used to be caused by polio, vaccination has also succeeded in greatly reducing cases formerly caused by other vaccine-preventable diseases.
"Mumps was a common cause of aseptic meningitis in the United States until the mumps vaccination came into use."
Once again, the antivaxers have it backwards. By greatly reducing or eliminating certain viral infections, immunization has helped children avoid hospitalization for meningitis - as it has with other formerly troublesome or potentially fatal complications.