keywords: polio vaccinating push spread africa
text: Push Against Polio Launched in Africa  JOHANNESBURG, Oct. 7 -- Teams were to spread out across 23 countries in sub-Saharan Africa on Friday to begin what global health officials hope is the final push against the crippling polio virus, with the goal of vaccinating 80 million children, including those in northern Nigeria, where opposition had derailed the eradication effort.