A vaccination and epidemic response adviser who is about to fly out to DR Congo to try to help in the fight against Ebola has told FRANCE 24 that the signs are the current outbreak will be a serious one. Already more than 130 people have been killed, with over 500 more cases detected. John Johnson is vaccination and epidemic response advisor at MSF and is due to fly to DR Congo on Thursday. He explained that part of the problem is that tests had been carried out for a more common strain of Ebola, so they were coming back negative. He spoke to us in Perspective.