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Wrong Strategy Could Lead to Worse Dengue Epidemics In Future
Targeting only mosquito larvae, and not adults, with insecticides may work in the short run, but could result in higher resistance in the insects and less disease immunity among humans, especially in urban settings, the study found.
Dengue is a mosquito-borne infection that causes severe, flu-like symptoms in some 50 million people every year, mainly in developing countries.
Global incidence of the disease, which is rarely fatal but often debilitating, has risen dramatically in recent decades, linked to both rapid urbanisation and the impact of global warming. Some 2.5 billion people are at risk.
There is no treatment, cure or vaccine -- the only way to control the disease is to kill the mosquitoes that carry it, especially one species: Aedes aegypti.
But which insecticides work best, how frequently they should be applied and whether it is more effective to target mosquitoes in their larval or adult stage are still debated among experts.
Researchers led by Paula Luz of the Oswaldo Cruz Foundation in Rio de Janeiro used mathematics and computer models to simulate the impact over five years of dozens of different strategies for reducing the vectors in which the blood-seeking insects breed and live.
The cost of different approaches was also taken into account, using World Health Organisation (WHO) guidelines as to "cost-effectiveness," that is, the trade off between results and the price tag.
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More News on: Dengue Fever, Dengue / Dengue Hemorrhagic Fever, Mosquito Diseases, Dengue and Homeopathy, Chikungunya and Homeopathy, Chikungunya
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