[Sungai Siput MP Dr D Jeyakumar] said 3% to 4% of them would be female and could copy the role of the wild female Aedes to spread dengue. He said such biological suppression could not completely eliminate the species from the environment and the government would have to go on purchasing, releasing and killing the GM mosquitoes. ”We would need billions of these transgenic mosquitoes for an average sized city,” he said. ”Wouldn’t it be more logical and productive if that same sum were spent in improving the drains and sewerage systems in our urban areas?”