See my analysis of the latest stats in my Post #9 above. The breakdown shows almost a DOUBLING of the Ebola outbreak in just a week. And this is just using the OFFICIAL stats which are probably way low.
When you consider the economic repercussions of quarantine for a country or even just a significant district, not to mention the complications there for provisions for those in the quarantined area, governments will be slow to act, despite the danger of the outbreak.