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The recent vaccine-derived polio outbreaks confirmed in Yemen and Sudan are consequences of increasingly low levels of immunity among children. Each outbreak has paralysed children in areas that have been extremely difficult if not impossible to reach with routine or supplementary polio vaccination for extended periods of time.

These outbreaks do not come as a total surprise. In Sudan, extensive population movement by nomadic communities, people displaced by conflict, frequent...

The civil war in South Sudan has forced more than two million children to flee their homes, according to two UN agencies. Children make up 62 percent of the more than 1.8 million South Sudanese refugees who have arrived mainly in Uganda, Kenya, Ethiopia and Sudan, say the UN children's fund, UNICEF, and the refugee agency, UNHCR. More than a million children have, meanwhile, been internally displaced. "No refugee crisis today worries me more than South Sudan," said Valentin Tapsoba, Africa...