Mrzzy, I know this can be fixating, but keep a balance. Simply to project a particular exponentiality presumes a homogenous population, unreactive to the problem until its too late. In this instance, the fear dynamic is important, but is not the only one: there is also a counter-dynamic in the conspiracy theorists on the ground, denying the disease and making themselves prime candidates to become victims.
Another important vector which seems to be under control is international transport, without it being readily available it might be a concern, but as it is, possible victims are being identified before they contaminate others.