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Current WHO phase of pandemic alert November 2005 Current phase of alert in the WHO global influenza preparedness plan - WHO global influenza preparedness plan Experts at WHO and elsewhere believe that the world is now closer to another influenza pandemic than at any time since 1968, when the last of the previous century's three pandemics occurred. WHO uses a series of six phases of pandemic alert as a system for informing the world of the seriousness of the threat and of the need to launch progressively more intense preparedness activities. The designation of phases, including decisions on when to move from one phase to another, is made by the Director-General of WHO. Each phase of alert coincides with a series of recommended activities to be undertaken by WHO, the international community, governments, and industry. Changes from one phase to another are triggered by several factors, which include the epidemiological behaviour of the disease and the characteristics of circulating viruses. The world is presently in phase 3: a new influenza virus subtype is causing disease in humans, but is not yet spreading efficiently and sustainably among humans.
Mexico portant des masques chirurgicaux
Zone en rouge, cas de grippe porcine confirmé, zone en jaune, cas non confirmé.
 Un premier cas de grippe porcine  par la ministre  espagnole de la Santé, Trinidad Jimenez, en Espagne vers Almansa, chez un homme de 23 ans qui avait séjourné au Mexique. 

Les ministres de la Santé de l'Union européenne se réuniront le jeudi 30 avril 2009, pour faire le point sur la menace de la grippe porcine. L'Organisation Mondiale de la Santé (OMS) prévient que , et que . Il faudra cependant .