CHARLES SHEY WIYSONGE, Director, Cochrane South Africa, South African Medical Research Council POLIO is a highly infectious disease. It’s caused by a virus that enters the body through the mouth. The virus then multiplies in the intestine and attacks the central nervous system – causing paralysis. Polio was one of the most dreaded diseases in the world in the 20th century. Four decades ago, an estimated 350,000 people were paralysed each year by the poliovirus in more than 125 countries. This led the World Health Assembly in 1988 to adopt a resolution for the worldwide eradication of polio, drawing inspiration…