During this time of air travel and biological warfare being possible. Anything is possible?!?
Also, I believe dengue is spread by mosquito bites, not person to person, but will check to be sure.
Gleeaikin, I too have not research this area but would it be possible to manufacture a synthetic form?
Some technical means might be found to spread some diseases, but it is unlikely that children from impoverished villages would be the vector.