If Dr. Spencer in NYC was not contagious until he began showing symptoms of Ebola - and the first symptom (at least, the first we know about) was the elevated temperature on Thursday last morning - why are people going around disinfecting everything he has come into contact with?
It seems that he felt sluggish back on Tuesday. Apparently feeling sluggish is not a symptom. In my mind, it is a symptom of the flu, so maybe he was celebrating the onset of seasonal flu with a trip to the bowling alley across town.
Perhaps sluggishness led to extremely poor choices, an inability to think clearly. I have had those symptoms with the flu in the past.
Julia Ioffe has an article in the NY Times on the phenom of America's frenzied indulgence in germ-spreading:
From where I sit, it often looks like the other side of American individualism, which becomes selfishness when you lay it on thick. It’s the belief that you and your needs are acutely exceptional and important, and take precedence over those of the people around you. It’s the unspoken belief that your day radiating sickness at the office is worth a couple of your colleagues being bedridden with your flu for a week.