Kolkata: Constant travelling and rapid urbanisation of rural areas have contributed to a nearly 50-fold increase in dengue cases over the last 50 years, say experts."Aedes aegypti was known to be the vector of urban areas and Aedes albopictus was responsible for the disease in rural and suburban areas. However, in recent times this division has blurred, because people move about a lot these days. This has led to a nearly 50-fold increase in dengue cases," Nemai Bhattacharya of the Department of Microbiology, at the School of Tropical Medicine, told IANS.According to the World Health Organisation (WHO), over 2.5 billion people - more than 40 percent of the world`s population - are now at risk from dengue, which is a viral disease spread by mosquitoes of the genus Aedes, principally A. aegypti.
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