I still believe the nurse deserves some blame. I'm a lay person, but after hearing what the symptoms are, and knowing that I had treated an Ebola patient, the first time my temperature even went up a 1/10 of a degree, my ass would have been getting to the hospital.
The Ebola virus should show up in the blood or stools long before a person is symptomatic except for the fever. After all, the fever means your body is trying to fight off the disease.