In another historic step for humanity towards a world free of polio, an independent commission of experts has certified that type 3 of the wild poliovirus had been eradicated globally. Following the eradication of smallpox and wild poliovirus type 2, experts say this news represents a historic achievement for humanity. For more on this, Elizabeth Lediga spoke to Dr Nicksy Gumede-Moeletsi, senior virologist at the World Health Organisation's Regional Office for Africa...