The children of those mosquito are not able to survive, thus the population is is decreasing.“Every two weeks we released on average 10-15 transgenic mosquitoes for every wild male,” explains Parry. “After six months, the frequency and number of releases can be reduced, but they need to be maintained over the long term.”
Dengue fever is rampant in tropical and subtropical regions; 50-100 million people are infected every year, of whom 25,000 die. Even so, the technique is costly. Jayme Souza-Neto, a scientist at São Paulo State University, estimates the cost for a city of 50,000 inhabitants at $900,000 to $2.2 million the first year, and $450,000 per year after that.