I've always traveled through De Gaulle on my way to and from West Africa (used to take Air Afrique, but these days Air France, Ethiopian and Air Maroc all go to

I've always traveled through De Gaulle on my way to and from West Africa (used to take Air Afrique, but these days Air France, Ethiopian and Air Maroc all go to Bamako). However, since the patient wasn't symptomatic until they were in Dallas, transits and port-of-entry don't have to worry. There's a large, fairly dense immigrant neighborhood just east of the hospital in question (the IRC does a lot of refugee relocations there), so there may have been exposure in that area.