Twenty-two more people have died of the Marburg virus in Angola over the past week, taking the toll to 277, and more deaths are feared, the World Health Organisation (WHO) said on Friday. "The number of cases is continuing to rise slowly...," WHO spokesman Iain Simpson told journalists. "I wouldn't say it is out of control but I wouldn't say it is under control either ... In fact we expect that there will be more cases," he added.