Vector-borne diseases are  diseases caused by pathogens that are transmitted to people by blood sucking arthropods commonly known as vectors such as  mosquitoes, fleas, lice, biting flies, bugs,  mites and ticks. Such diseases commonly occur in tropical and sub-tropical regions of this earth where access to safe drinking-water and sanitation systems is problematic. Vector-borne diseases constitute  17% of the estimated global burden of all infectious diseases. While the most deadly vector-borne disease is  malaria that causes an estimated 627 000 deaths in 2012,  the world's fastest growing vector-borne disease is dengue, with a 30-fold increase in disease incidence over the last 50 years.