Seems to me that news management is in full swing over this.
The Ebola virus has already exceeded the predicted transmission rates, the revised predicted rates and revised, revised predicted rate. WHO has just revised its predicted infection rate upwards again.
It has been known for a long time that the biggest public health risk to a developed economy is a highly infectious virus with a high mortality rate. The management plan is already in place, but it is massively expensive and would be very difficult politically for any government to impose. I think we are being spoon fed information at the moment to justify incremental measures.
It's worth thinking what exponential growth actually means:
growth whose rate becomes ever more rapid in proportion to the growing total number or size.
The more people infected the more people will be infected - 2 become 6 become 24 become 96 etc etc.
The BBC are saying Ebola infection is growing exponentially in West Africa. This is not a virus that you get pockets of. If it's there it's there and it will get bigger. The answer? Sector containment. You can bet that the government has already discussed it and the press are gradually ramping up public anxiety to the point where it becomes acceptable.