galaxosmithkline says it hopes to finish the testing by the end of 2015. both elements of the test vaccine, they have been shown to be safe in humans. but a study just published suggests the ebola virus in west africa is mutating fast, and this could blunt the effectiveness of the vaccines. >> from long experience with developing vaccines, you have to be careful when you first put it into humans to make sure above all that is it safe; that there are no unexpected adverse reactions, and that's why you go in very slowly with very few people and follow them carefully. >> reporter: with the number of new cases last week at their highest so far, the w.h.o. has warned that it could take months, even years to bring the outbreak under control. >>> four of the six men accused of trying to kill a former rwandan military general have been found guilty, but two other accused have been acquitted. the attack on a close associate of the rwandan president happened in 2010. he accused the men of working for the rwandan government. the president has always denied any involv