In 2005, Hu Haitoa took his son, Hu Bing, to a local clinic in East China’s Shandong province. There, the four and a half month old baby received a vaccination to prevent polio. But 14 days later the infant showed signs of a serious reaction. The child slipped into a brief coma and also experienced heart failure after being taken to the hospital. He recovered after three days of treatment, although his left leg has since become paralyzed. The hospital said he was suffering from polio but did not give a more specific explanation.