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African countries on Thursday pledged to send more than 1,000 health workers to Ebola-ravaged Sierra Leone, Guinea and Liberia, where the World Health Organization says the spread of the killer virus "remains of great concern". African Union chief Nkosazana Dlamini-Zuma said the regional bloc was responding to an urgent need for well-trained medical reinforcements to help in the fight against the world's worst-ever outbreak of the disease. "Several African member states have pledged to send in a number of health workers to Liberia, Sierra Leone and Guinea, including DR Congo which will send around 1,000 workers in three groups," Dlamini-Zuma told reporters in Freetown. East African members of the bloc had earlier pledged to send another 600 health workers, she added.