Pandemic influenza is by nature an international issue; it requires an international solution.

Based on assessment of all available information and following several expert consultations, I have decided to raise the current level of influenza pandemic alert from phase 4 to phase 5.

The unique nature about the influenza virus is its great potential for changes, for mutation.

For the first time in history we can track the evolution of a pandemic in real time. Influenza viruses are notorious for their rapid mutation and unpredictable behaviour.

New and emerging infections keep coming back and the world needs a collective defense system, and that requires international cooperation and collaboration, in the name of global solidarity.

Influenza pandemics must be taken seriously, precisely because of their capacity to spread rapidly to every country in the world.