Ask and ye shall receive:
How is dengue contracted?(emphasis mine)The virus is contracted from the bite of a striped Aedes aegypti mosquito that has previously bitten an infected person.
Excerpted from:
The prevention of dengue requires control or eradication of the mosquitoes carrying the virus that causes dengue.
Outlawing DDT has led to an increase in Dengue fever the same way that it has led to an increase in malaria.
Illegal aliens cause a lot of problems and it's good to point them out, but blaming the spread of a non-contagious disease on illegal aliens is disingenious. There'd have to be a HELL of a lot of Dengue-infected illegals bitten by a HELL of a lot of mosquitoes to cause such an outbreak. It's quite a stretch to put the blame on the mosquitos. Put the blame where it belongs -- on lack of adequate pesticides.
The Dengue problem is a perfect illustration of the evils of rampant environmentalism. If DDT was still in use, there wouldn't be the Dengue problem we're seeing now.