Phase four means that a virus has gained the ability to cause community-level outbreaks.

VOA: special.2009.05.06

Peter Harling, an Iraq specialist at the International Crisis Group in Damascus, countered that al-Qaida has shown a remarkable ability to replace its leaders.

VOA: standard.2010.05.10

The president says Congress must put politics aside, and understand that America has the ability to handle detainee cases - from those easily transferred to civilian courts, to those considered a severe threat who for one reason or another cannot be prosecuted.

VOA: standard.2009.05.21