[Dengue in Mexico: an analysis of two decades].

Dengue is one of the main vector-borne diseases and has become a severe Public Health problem during the last decade, both in Mexico and worldwide. This report analyses two decades (1990-2011) of dengue in Mexico, based on reports published by the Ministry of Health. The data show that although the incidence rate of dengue in Mexico has remained constant throughout the last two decades, the incidence rate for dengue hemorrhagic fever has increased importantly since 2002 (20% of cases). Additionally, during the last decade, the increase in the incidence rate of dengue and dengue hemorrhagic fever has shifted towards a younger population and the disease outbreaks showed a longer duration throughout the year. We conclude that dengue is showing a changing pattern and the factors involved remain to be analyzed.