 As well as malaria, mosquitoes carry other diseases. One particular type of mosquito, called Aedes aegypti, is a major vector of dengue and chikungunya. Aedes aegypti went to the Caribbean, got taken to the Caribbean, probably as part of the slave trade. Its home is in Africa, but it has spread not just to the Caribbean and the New World, but throughout Asia as well, so it's now cosmo-tropical.