Ebola is fortunately less contagious than malaria.
There was an epidemic of Chikunguya in the DR where I recently spent three weeks. I came equipped with a lot of repellent and mosquito netting, but I saw not a single mosquito. Most of the people I know there had already contracted the virus, some twice, as there are two strains, or simply were immune, and no one in the area was infected that I knew of.
The rumor was that it was spread by the Chinese. Of course, there would have been no motive for that. The Chinese export lots of stuff to the DR, especially Suzuki and Lonchn motorcycles and dozens of brands of scooters. Some are Japanese brands, but all are made in China. There is a large Great Wall auto and truck dealership in Santo Domingo, it covers a city block on one of the main streets. The Chinese have been exporting vehicles for so long that there are also beat up Cherys and other Chinese brands on the street.