Why Ebola Patients Are Getting Treatment in Nebraska
"Freelance journalist Ashoka Mukpo, who contracted Ebola in Liberia, arrived at the University of Nebraska Medical Center today, becoming the second patient with the deadly disease to be treated there.
Why is he being sent to Nebraska instead of some other facility? Because the hospital is home to the largest of four high-level biocontainment patient care units in the U.S..."
More at http://www.npr.org/blogs/thetwo-way/2014/10/06/354083214/why-ebola-patients-are-getting-treatment-in-nebraska
No they aren't taking any chances with actual, known ebola patients entering the U.S. Too bad some stupid fool made a terrible mistake with Mr. Duncan in Dallas. You think the people that had contact with him aren't scared shitless right now? Especially the EMTs?
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not 4 patients. 
As far as I know, there are only two patients in the US, Mr. Duncan (Dallas) and Mr. Mukpo (Nebraska). The three missionaries have recovered.
One of the missionaries who recovered in Nebraska, Dr. Scarpa, is back in the hospital because of pneumonia but he is being isolated as a precaution--i don't think he has any virus left in his system or they would not have released him, but the pneumonia was probably brought on by the tremendous stress this disease took on his body.