Ebola

Employ a lethal virus in an attempt to kill 1/2 the armies, rounded down, in 1 area of your choice.  Roll 1 die.  If the result is 1, 2, or 3, only the target area is affected.  I the result is 4, the virus escapes and affects every area on the map.  If the result is 5 or 6, the virus escapes and affects a random continent.  To determine which one, draw the next card.  If its a Wild Card, there is no effect.  Otherwise, the virus affects every area on the continent that contains the area named on the card.