It is unclear how airborne it can be, see the Hot Zone for a terrifying read.

Now numbers are (from Google News' Ebola heading)
As of July 12, the cumulative number of Ebola virus cases in Guinea, Liberia and Sierra Leone was at 964, including 603 deaths. The death toll has almost doubled in a month's time; reported deaths in the three countries in mid-June was 350.

603/964 still only about .62 death rate, still very low for Ebola. And I am finally hearing about RCI not allowing refugees from the stricken areas across the border - (1) about time and (2) yikes, they need refuge.