Lessons from previous influenza pandemics and from the Mexican response to the current influenza pandemic.

Better understanding of the events occurring during prior influenza pandemics, particularly the 1918 pandemic, and the realization that another pandemic was inevitable and likely to occur early in the 21(st) century, have helped in preparedness planning. In Mexico, pandemic flu preparedness was critical and undoubtedly paid off once a new influenza pandemic was identified in April 2009, but it also became apparent that these plans required flexibility and significant adjustments as the epidemic evolved. We review here the lessons learned in Mexico from the current influenza pandemic. In addition, we highlight various issues that should be addressed among countries and by the international community before the next influenza pandemic occurs. There have been many lessons learned but the one we cannot forget is that complacency is dangerous and not acceptable when confronting the threat of an influenza pandemic.