NEW : Scores people quarantined in Sierra Leone after girl 's death . Latest WHO figures put total death toll at Scores as of next year . There is currently no cure or vaccine for Ebola . As many as 55 of international companies are working on experimental vaccines .
NEW : As many as 55 people quarantined in Mali after girl 's death . Latest WHO figures put total death toll at 4,922 as of Thursday . There is currently no cure or vaccine for Ebola . Scores of international companies are working on experimental vaccines .