Macaronesia, Humans, Disease Outbreaks, Molecular Epidemiology, Madeira, Phylogeography, Sequence Analysis, DNA, Genotype, Portugal - epidemiology, Cluster Analysis, Dengue - epidemiology, Dengue - virology, Dengue Virus - classification, Dengue Virus - genetics, Dengue Virus - isolation \& purification, Gene Products, env - genetics, Venezuela - epidemiolog...