Zika will not "spread all across the globe" because the vectors that transmit it are not present "all across the globe." The only way it can be spread person-to-person at this point is sexual transmission, so unless there is very much hanky panky going on around the world it will not "spread all across the globe."
not just by sexual transmission.
Zika is spread by a mosquito biting an infected person and then biting an uninfected person thereby infecting him.
a person who contracts zika while traveling and then returns to the US, is a source of the spread as follows:
Step 1: Joe contracts zika while traveling in a zika area. Joe now goes back home to the US.
Step 2: an aedes mosquito living in the US bites joe and sucks up his zika infected blood.
Step 3: the same mosquito then bites jeremy and injects the zika into jeremy while biting him. This is called locally transmitted zika, as jeremy has contracted zika from a local mosquito.
So yes, Joe can also get others sick in the sexual transmission route. But he can get others sick by means of a mosquito.
So. To put this in the Florida context. Or even more, in the disney world context.
Lots of visitors come to disney world from brazil. Possibly some of them are carrying zika and will possibly be bitten by a local aedes mosquito while visiting disney world. And then the mosquito in turn will bite someone else....
this is why it's very difficult to get control of a disease that is spread in this way...
it probably will eventually make it to every place that has aedes mosquitoes (a large part of the world)...
..