From NPR.

Mosquitoes infect over 250 million people each year with the parasite that causes malaria, but new research in the journal "Nature" suggests those infections could be prevented with a tiny tweak to the mosquito’s genome.

To infect a person, the parasite that causes malaria must travel from the mosquito’s gut to its salivary glands. Researchers disrupted this journey by changing just a few letters of the mosquitoes genome, effectively blocking transmission. The researchers are working on ways to spread this genetic tweak quickly, through a whole population. But they say it’ll be several years before the genetic technology is even tested in the field, much less the real world.