摘要：Summary. The impact of weather change and global pollution on the development and/or the transformation
of microorganisms is no longer to be demonstrated. In this respect, heavy trends can be taken
into account. This general context needs the development of anticipation procedures and the knowledge
of the perception of prevention by the public for short, medium and long term actions. After a short
discussion on the concept of emerging issues, the authors present some past examples of public health
programs. These examples (malaria, dengue, chikungunya and cholera) are used to propose optimized
ways of decision/action that may help to avoid possible crisis in a rapidly changing world. Then, the different
lessons learnt are, under certain limits, associated with a forecasting analysis
