important distinction. up until recently, all the cases in the u.s. were travelers. they caught zika, came back to the united states, and were diagnosed. but now in miami, in this area, we're seeing something new. that is people who never traveled, they got bit by a mosquito in florida. and got zika. that is a whole different level of transmission. >> all right, elizabeth cohen, thank you very much for putting that in perspective. coming up, 309 buildings and counting have been destroyed in what is called the blue cut fire in california. we'll have an update from the areas hardest hit next.