"...On Tuesday — the day Dr. Spencer first began to feel sluggish..."
...
This is about as close as you can get it. This Dr. acted very foolishly and it might be nothing more than luck if he hasn't spread it to anyone else. He acted very foolishly on the 21st and 2erd imo.
In all of the stories I've seen on ebola, sluggishness has not been listed as a symptom.