( CNN ) -- As the world reels from its deadliest Ebola outbreak , health experts are fast-tracking tests for various vaccines , and hope to have millions of experimental doses by next year . There is currently no cure or vaccine for Ebola , which continues to spread in Liberia , Sierra Leone and Guinea . The virus has killed nearly 5,000 people -- mostly in those three nations -- and infected twice that number . Scientists racing to stop the epidemic are trying various experimental drugs on patients , including ZMapp and TKM-Ebola . In addition to drug development , there 's a scramble to develop vaccines , with scores of companies working on experimental doses , the World Health Organization said this week . Health care workers in affected nations will get the first opportunity to try the experimental vaccines . GlaxoSmithKline and the Public Health Agency of Canada are already conducting the first phase of clinical trials for two experimental vaccines , according to the WHO . The latter hopes to have 12 million experimental doses by the first quarter of next year . The GSK vaccine is being tried on healthy volunteers in the United Kingdom and Mali ; the Canadian one is undergoing testing on healthy volunteers in the United States . `` If the vaccines are determined to be safe , tens of thousands of doses could be used in West African trials beginning in January of next year , '' the WHO said . Other vaccines in the works include those by Protein Sciences and Inovio , and another one by Russian scientists . According to the latest WHO figures released Saturday , there have been at least 10,141 cases of Ebola -- with 4,922 reported deaths -- as of Thursday . Liberia , Sierra Leone and Guinea account for nearly all the cases . All but one district in Liberia and all districts in Sierra Leone have reported at least one case of Ebola since the start of the outbreak in March , the WHO said . About 450 health workers have caught the virus worldwide . Of those , 244 have died . Ebola is spread by direct contact with the bodily fluids of an infected person . The push for vaccines came as new cases of Ebola were confirmed in New York and Mali , the latter the first case in that nation . Complete coverage on Ebola . CNN 's Jen Christensen and journalist Katarina Hoije contributed to this report .
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 .