There is currently no screening taking place.
None.
You will not be asked or asked to declare on the entry form if you knowingly had contact with Ebola.
No screening will take place until there is a non DNC administration in the White House.
The current US Customs Decleration rev May 2014:
CFR 5316 OMB NO. 1651-0009
If I ran Liberia or Sierra Leone, I would fly dozens of infected to Jfk to compel the one nation capable , to come up with a cure.