Bill Gates believes that genetically modified mosquitoes could help reduce malaria deaths within the next 5 years. Researchers are developing a "gene drive" technique to alter mosquitoes so they pass on malaria resistance to nearly all offspring. This could quickly alter entire mosquito populations. While the technology may help reduce malaria, some researchers have raised concerns about potential unintended consequences if the GM mosquitoes crossbreed with other species or develop unexpected mutations. Gates remains optimistic this approach can be made safe with further testing and regulation.