Phase five is marked by human-to-human spread of the virus into at least two countries in the same area of the world.

VOA: special.2009.05.06

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

VOA: special.2009.05.06

"By going to phase six, what this would mean is that the spread of the virus is continued and that activity has become established in at least two regions of the world.

VOA: special.2009.06.10

Clegg's Liberal Democrats want to phase out Britain's own nuclear weapons, but his rivals, including Prime Minister Gordon Brown,say this would send the wrong message to Tehran.

VOA: standard.2010.04.30

The WHO's Phase 5 threat warning signals that a global pandemic could be imminent, but has yet to develop, with human-to-human transmission occurring in many geographical locations.

VOA: standard.2009.04.30

But it has taken on new urgency,coming one day after the World Health Organization raised its global swine flu alert to Phase 4 on the six-point scale.

VOA: standard.2009.04.28

Diplomats and observers warn that this could be the deadliest phase of the war, as the army tries to target the rebels mixed in the civilian population.

VOA: standard.2009.04.06

The last phase of the new missile defense plan, to be ready by 2020, would be to develop interceptors with the capability of blocking long-range Iranian missiles aimed at the United States.

VOA: standard.2009.09.17

But John VandeBerg of the Southwest National Primate Research Center says if the proposed legislation to phase out medical research on chimpanzees is passed, scientists like him will have to end their work.

VOA: standard.2010.02.16

"It is our intention to conclude this phase of our discussions in the very near future, within the timeframes that you suggest, to enable us to move on to the more important phase,".

VOA: standard.2009.09.14

At each stop, I have emphasized president Obama's message that our strategy working with you may be in a new phase, but we pledge our full and continuing commitment to Iraq and the Iraqi people.

VOA: standard.2009.04.25

(Speaking) Mr.Gbagbo says that thanks to the support of the international community, and in particular thanks to the work and desire for peace of his fellow Ivorians, the electoral process has entered an irreversible phase.

VOA: standard.2009.09.29

"This change to a higher phase of alert is a signal to governments, to ministries of health and other ministries, to the pharmaceutical industry and the business community that certain actions should now be undertaken with increased urgency, and at an accelerated pace,"

VOA: standard.2009.04.29

The World Health Organization says it needs to see clear evidence of sustained community transmission of the swine flu virus from person-to-person in at least two regions of the world before it raises its alert to the phase six pandemic level.

VOA: standard.2009.05.14