Ebola virus in Dallas. At what point will you decide to lock yourself in the house to avoid infection? What news could trigger your decision to keep your kids home from school?
Nigeria had one Ebola-infected man fly into an airport and ended up with almost 1,000 infections before containing the virus.
Since the first patient -- a dying Liberian-American -- flew into Lagos, Nigeria's largest city, on July 20, the disease spread to 20 other people in two cities, who had contact with nearly 900 others.
Every known patient has now died or recovered, and the cure rate -- 60 percent -- was unusually high for an African outbreak.
No reason to think there would be far fewer infections in the United States.