What if the numbers work out against vaccination?<p>To quote CDC  <a href="http:&#x2F;&#x2F;www.cdc.gov&#x2F;vaccines&#x2F;vpd-vac&#x2F;polio&#x2F;dis-faqs.htm" rel="nofollow">http:&#x2F;&#x2F;www.cdc.gov&#x2F;vaccines&#x2F;vpd-vac&#x2F;polio&#x2F;dis-faqs.htm</a><p>&quot;Of the 162 cases, eight cases were acquired outside the United States and imported. The last imported case caused by wild poliovirus into the United States was reported in 1993. The remaining 154 cases were vaccine-associated paralytic polio (VAPP) caused by live oral poliovirus vaccine (OPV).&quot;<p>162 polio-related issues, 8 from actual virus, 154 from the vaccine.