Two Strains of Polio Down, One to Go

October 23, 2019

(Scientific American) – The international effort to achieve this goal passed a major milestone this week with the worldwide eradication of wild poliovirus type 3. The announcement, due Thursday from the Global Commission for the Certification of the Eradication of Poliomyelitis comes just four years after eradication of wild poliovirus type 2. It leaves only a single strain, wild poliovirus type 1, on the loose. Type 1 is now holed up in the smallest area in the history of the disease—though that area comprises politically and geographically fraught regions of Pakistan and Afghanistan.