How many people did he touch, how many surfaces that have hands on them did he get live ebola virus on? Was he coughing a lot? Was he on an airplane coughing a lot while the air circulates? Did he sneeze on any handrails? Who did he come into contact with?
How many other people are out there doing the same thing?
He was under observation because of prior contact with ebola patients.
He was not forthcoming with this information to the Senegalese authorities.
http://www.trust.org/item/20140829130352-8c0g8/?
The coughing would not be a factor, since Ebola spreads by droplets, but not aerosols. You would need to be within about 6 feet for droplets to reach you.
This guy would not have been infectious before he showed symptoms. Hopefully, all of his contacts since he became symptomatic can be traced and monitored.