It's a cold, damp fall day in London. But in a windowless basement laboratory, it feels like the tropics. It's hot and humid. That's to keep the mosquitoes happy.
"In this cage, we have the adult mosquitoes," says Andrew Hammond, a genetic engineer at Imperial College London, as he picks up a container made out of white mosquito netting.
The lab is buzzing with hundreds of mosquitoes. "Everything in this cubicle is genetically modified," Hammond says, pointing to the container of mosquitoes.