【正确答案】A rare virus, Ebola has attracted broad and serious attention by the medical community ever since it was first detected in South Sudan and areas near the Ebola River of Congo in 1976. Ebola was named after the river where it was found. As the Ebola epidemic sweeps through West Africa, scientists lack key genetic data to answer a question that has provoked much worried speculation: Is the virus becoming more transmissible or more deadly? Is the virus acquiring changes that would let it evade diagnostic tests or vaccines? Thousands of blood samples from Ebola patients have been sitting in refrigerators in Africa and Europe, untouched. And, as Science went to press, the few groups that have new genomic sequence data have not made them public.