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By Saliou Samb and Emma Farge CONAKRY/DAKAR (Reuters) - The number of new Ebola cases rose for the second week in a row in West Africa, nearly doubling in Guinea, suggesting declines in the disease seen earlier this year had stalled, the World Health Organization said on Wednesday. Efforts to wipe out the deadly virus were being hampered by people's mistrust of health workers, and the number of people continuing to hide sick friends and relatives from authorities, particularly in Guinea's capital Conakry, officials said. West Africa recorded 144 new confirmed cases of Ebola in the week to Feb. 8 compared with 124 the previous week, the WHO said in a report. "Despite improvements in case finding and management, burial practices, and community engagement, the decline in case incidence has stalled," the U.N. agency said. In Guinea, where the outbreak began, there were 64 new cases compared with 39 the previous week. "The main threat to achieving our goal of zero cases in 60 days is this resistance in Conakry," Dr. Sakoba Keita, national coordinator for the fight against the epidemic in Guinea, said. Guinea's President Alpha Conde has announced a plan to have no Ebola cases by early March. But in an illustration of the remaining challenges, youths from the Conakry suburb of Yimbaya spilled onto the streets on Monday, burning tyres after an imam suspected of conducting a secret Ebola burial was detained by authorities. The U.N. said this week that 70 schools across the country had been unable to open because of local suspicions of medical kits being distributed to students. The worst outbreak on record has now killed at least 9,177 people out of 22,894 recorded cases, mainly in the three worst-affected West African nations, Guinea, Sierra Leone and Liberia. Sierra Leone remains the country with the highest transmission, although case numbers dropped week-on-week to 76 from 80. Liberia, once the epicentre of the outbreak, reported just three cases in the same period. President Barack Obama said on Wednesday he was bringing back nearly all U.S. troops fighting the Ebola epidemic in West Africa and marking a new phase in the battle to help countries "get to zero" cases. Guinea has the longest way to go in ending the outbreak, he added. Obama said wealthy countries needed to invest to ensure that poor nations have basic health systems to detect and fight diseases. "This is not charity," he said in a speech at the White House. "The investments we make overseas are in our self-interest." (Reporting by Saliou Samb, Emma Farge and David Lewis; Editing by Andrew Heavens and Robin Pomeroy)