Guide To Pandemic Alert Levels

Here are the details of the six phases:

PHASE 1
No animal influenza virus circulating among animals is reported to cause infection in humans.

PHASE 2
Animal influenza virus is known to have caused infection in humans and is therefore a potential pandemic threat.

PHASE 3
Animal or human-animal influenza virus causes sporadic cases or clusters of cases in people, but no human-to-human transmission, except in specific circumstances.

PHASE 4
Human-to-human transmission of an animal or human-animal influenza virus able to sustain community-level outbreaks.

The ability to cause sustained disease outbreaks in a community marks a significant upwards shift in the risk for a pandemic.

PHASE 5
The same virus causes sustained community-level outbreaks in two or more countries in one region.

While most countries will not be affected at this stage, the declaration of Phase 5 is a strong signal that a pandemic is imminent and that the time to finalise the organisation, communication, and implementation of the planned mitigation measures is short.

PHASE 6
The virus causes sustained community-level outbreaks in more than one region.

Designation of this phase will indicate that a global pandemic is under way.

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