[Present and future of infectious epidemiology].

A revision is made on the important biological phenomenon of microbial emergency, based on model infection diseases in which the author can give the own experimental results and experience. The concept of microbial emergency has shocked the traditional infectious epidemiology since 1983 when the HIV virus was discovered and the informatic network reached an optimum efficiency. In despite of the global risk of contagion it is necessary to consider the proximity effect in a space-time model as the main cause of infectious diseases diffusion.