→ Dengue is a mosquito-borne viral infection caused by dengue virus infected female mosquitoes — Aedes aegypti and Aedes albopictus. → Chikungunya (to become contorted) is a mosquito-borne viral disease. It is caused by an Alphavirus belonging to the family Togaviridae. The virus is transmitted from human to human by the bites of infected female mosquitoes Aedes aegypti and Aedes albopictus.