[Emerging infectious diseases in the realm of complexity: implications for scientific and technological policies].

The current emergence and global dissemination of some new and resurgent infectious diseases have surpassed national frontiers, increasingly affecting developing and also developed countries. This study stresses that this outburst is affecting the predictability of dominant health transition approaches. This paper analyses, from epistemological and policy viewpoints, alternative approaches in order to confront these new global epidemiological trends.