david samadi. good morning.ary. >> we've reported this beginning of this year, january of this year, we reported one of the first cases of zika in this country. over the last two months, we see about 600 cases in the u.s. there's nothing to panic now. a lot of times this virus is not lethal and symptoms are mild. for pregnant women, obviously it can cause premature birth, blindness, and microcephaly. those are the ones. the other issue is that we thought maybe we'd have this in 12 states, it's spreading in about 30 states. >> the red states are states to worry about. >> exactly. puerto rico -- >> florida, texas, california -- >> those are hot states could especially puerto rico, seeing doubling in numbers every week. so people have to be careful about this. >> doctor, why is it spreading so quickly? it took a while even to get to south america. why here so quickly? >> that's one of the big concerns. took years for it to go from africa to south america. eight years to travel in south america. now very quickly. pa