IRONICALLY, IT COMES FROM A VACCINE: Poliovirus that paralyzed unvaccinated NY man in July is still spreading. “Most adults and children in the US are vaccinated against polio. Since 2000, the country has relied on inactivated polio vaccine (IPV), which is given in three doses before the age of 24 months, with a fourth shot between the ages of 4 and 6. Just the first three doses are 99 percent to 100 percent effective at preventing paralytic disease, though, and vaccination coverage rates report the percentage of 2-year-olds that have followed the recommended vaccination schedule for the first three shots. But, in pockets of low vaccination, such as those in several counties in New York, poliovirus—in this case, a revertant virus derived from an oral vaccine used abroad that transmitted among unvaccinated people—can continue spreading. In the CDC’s new study out today, health officials sifted through sewage surveillance data to see where and how extensive that spread is.”