Open the door to a vault-like room at the University of California, Davis, and the cool sterility of a laboratory gives way to the sticky heat of the tropics, with thousands of mosquitoes buzzing in cages and feasting on blood.
Here in the university's medical-sciences complex, researchers are studying mosquitoes that they have genetically altered to resist the parasite that causes malaria.
In other words, malaria-proof mosquitoes.