To create this breed, researchers at the Irvine and
San Diego campuses inserted a DNA element into
the germ line of Anopheles stephensi mosquitoes
that resulted in the gene preventing malaria
transmission being passed on to an astonishing
99.5 percent of offspring. A. stephensi is a leading
malaria vector in Asia..."
http://news.uci.edu/research/university-of-california-scientists-create-malaria-blocking-mosquitoes/