A plan to release about 3,000 genetically modified Aedes mosquitoes into the environment may be just the weapon needed to curb the spread of the deadly dengue fever. The National Biosafety Board is studying the plan in view of the alarming number of lives lost in the country to the infectious disease. But the Third World Network, an independent non-profit international body involved in issues relating to development, has sounded a warning: don't jump the gun.