Scientists believe they are closer to being able to change the DNA of wild mosquitoes in order to combat malaria.
In the laboratory, they made a gene spread from a handful of mosquitoes to most of the population in just a few generations, according to a report in Nature.
If the right gene can be made to spread then researchers hope to reduce the number of cases of malaria.
Other academics have described the study as a major step forward.
The World Health Organisation estimated that malaria caused nearly one million deaths in 2008.
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