Emerging arboviruses may occur in zones where they do not exist. Dengue which originally was located in southeastern Asia, is the most important arbovirusis in the world.

The occurrence of dengue haemorrhagic fever (DHF) in Asia and America, mostly in urban areas, increased the global concern about dengue. Likewise, cases of DHF are not reported in Africa and in the Indian Ocean southwestern islands.

Vectors

 An arbovirus requires a competent haematophagous arthropod for transmission from one vertebrate to another susceptible host.

 Air transportations allow quick transfers from place to place and the diffusion of potential vectors or infectious hosts. The merchandise transportation by containers allowed the diffusion of Ae. albopictus from Asia through Africa and America.

 Aedes albopictus
 Aedes aegypti

Diseases

 Dengue

• dengue haemorrhagic fever (DHF)

 yellow fever
 japanese encephalitis
 Rift valley fever
 crimean-Congo haemorrhagic fever
 West Nile encephalitis
 Sindbis
 Wesselsbron
 Chikungunya