Dengue imposes a whopping $8.9 billion economic burden every year on 141 countries and territories where active transmission of the disease has been identified a new study says. Our global estimates suggest that in 2013 there were a total of 58 40 million symptomatic dengue virus infections including 13586 fatal cases and that the total annual global cost of dengue illness was $8 9 billion said the study published in the Lancet Infectious Diseases journal. Dengue is the world's fastest growing mosquito-borne disease currently threatening about half the world's population and leading to an estimated 60-100 million symptomatic dengue cases