Dengue Fever Prevention: Vaccinating Mosquitoes With Bacteria To Protect People: BUT may be the best is to avoid mosquitoes bite person who have fever and transfer virus to others. NOT just kill the mosquitoes.

http://www.huffingtonpost.com/2011/08/24/bacteria-dengue-control-mosquito-vaccine_n_935141.html

a pair of Australian studies published on Wednesday in the journal Nature, injecting a harmless bacterium into mosquitoes that can be passed on to the insects' offspring could thwart the ability of the dengue virus to replicate.