Well, the infectiousness of Ebola specifically is questionable. In essence, there is good reason to believe the virus won't be able to spread far outside the areas where it already proved to be successful. So if you're in the EU or the US, even large parts of Asia, you're probably safe.

But that doesn't mean a mutated strain could potentially befall the whole world. The same goes for the more terrifying types of the flu. There is always the potential for a deadly and extremely contagious pathogen to develop.

So what to do in a pandemic situation? I'm hesitant to admit it, but basically the survivalists have it right: hole up somewhere off the beaten path and avoid all outside contact, that potentially includes all kinds of animals like birds and livestock. Then you'll have to wait until a vaccine is developed. If a vaccine is feasible.