KARACHI: Three days anti polio campaign commenced in Sindh on Monday. Health Secretary Fazlullah Pechuho informed that campaign will vaccinate 8.4 million children under the age of five. Meanwhile, 2.2 million children amongst 8.4 million will be vaccinated in 188 union councils of Karachi, the rest of them will be vaccinated across districts of Sindh. There will be 5,000 policemen guarding the 1,200 volunteers for administering anti drops. Emergency Operation Centre coordinator Fayaz Jatoi said there have effective improvements in the program with polio cases lowering from 306 cases in 2014 to 20 cases in 2015. However, their goal was to reach zero cases, he said. Nigeria, Afghanistan and Pakistan are the only countries with polio virus.