[laughter] batik ebola virus is the safety level for aged and for which there is no vaccine and no cure. in the laboratory you have to be wearing a high-level of protective gear to work with quantities of the virus. these are beautiful photographs one that is thought to me that a hiding place and it begins to replicate like mad inside the cell and that replication cycle peaks 18 hours after the first particle. and essentially the virus turns that sell into a factory. and it gets a swollen shape and then they begin to grow out like hair and will -- one would produce thousands and thousands of these particles the virus takes its sweet time and they tend to last a lot longer that die once hiv is active. and to have this capability to keep the hose to sell a live longer. and in west africa that net effect on human as it multiplies in the body tissues spew out thousands of particles the titres of the virus or the quantity of the particles goes up astronomically. and at the end of the ebola infection the bloodstream is really loaded with these particles. nobody understands how person dies of