To get Ebola, you have to have bare skin contact with the patient’s bodily fluids. As long as those handling the infected are properly attired, there will not be any further cases.
They probably brought them into the country so they can study it in a proper facility than an African one.
http://www.bbc.com/news/science-environment-20341423
“Growing concerns over ‘in the air’ transmission of Ebola”
The original Nature publication:
http://www.nature.com/srep/2012/121115/srep00811/full/srep00811.html
Yep, living test tubes. Good thinking.