The latest issue of The Lancet has several important articles; I'll try to link to them over the day. To begin with: Chikungunya in the Americas. After describing the disease and summarizing the recent Caribbean outbreak, the authors conclude:
This episode represents the first evidence for the emergence of autochthonous chikungunya cases in the Americas. It is likely that the chikungunya epidemic will extend to other Caribbean islands, and it also has substantial potential for spreading from this region visited yearly by millions of tourists to the American mainland where A aegypti is endemic.
Assuming that this strain will be transmitted efficiently by A albopictus mosquitoes, its persistence in the Caribbean would also represent, as a consequence of seasonal synchronicity, a great threat for southern European countries where the mosquito has recently dispersed. This situation warrants reinforced epidemiological surveillance and specific preparedness.