Dengue fever is a viral disease transmitted by Aedes aegypti. It has b
een recently incorporated to the agenda of priorities in many countrie
s in the Americas. The emergence of dengue hemorrhagic fever cases is
becoming a public health threat and requires the implementation of int
ensive surveillance and control strategies. The epidemiological panora
ma of dengue in Mexico provides the opportunity to analyze a regional
health problem and the risk factors involved in the genesis of hemorrh
agic cases under a situation that has not reached epidemic proportions
yet.