vitali rate which were alluding to but it has other properties which intrinsic properties would also hargis for example, its capacity for asymptomatic spread which was not present in sars one in 2003 but which this virus had which made it difficult to manage and in addition and this is taking up on what you just said its capacity for protein manifestations. the range of the policy this virus causes from no symptoms to mild symptoms to three symptoms to death in the number of organ systems it affects or can affect from the g.i. tract to the pulmonary system, the cardiac system, , nervous system and son has caused a lot of confusion and made it difficult for us. let me illustrate this. imagine you have 1000 patient in world a content and get seriously ill and one dies. that's an infection of the data rate of one out of ten. that's 10% people die. now imagine a a new world of 0 patients, world b ten of them again gets tersely ill and one dies but in addition nine get a mild illness of one out of 100 people dies. if i ask the average person which world would you rather be in, most people wrongl