and the international efforts to contain the disease. gillian tang is a buyer ologist at the university of lester in the u. k. i asked him to tell us more about the surgeon impacts cases and how this outbreak differs from the 12 years ago. the difference is really due to the different plates of strains, if you like, of this impulse fires the stream from 2 years ago. it was a global strain and to try to which is the single best after constrain i pretty much milder and more limited in terms of clinical severity than the original kind. one virus. the one is now a spitting course, actually to is a branch of the, played one virus now to take on b. and this part, the originals frank strain from that the aussie democratic, the condo, this has a high mortality is most of the same in clay. as mate increasing, which has disability compared to the original, endemic played one a strain from the all c to talk to us more about this transmit ability because the, this impacts variance is now it's just new strain has spread to 13 countries. the outbreak of hundreds of people have died mainly children. why has thi