US scientists say they have bred a genetically modified (GM) mosquito that can resist malaria infection.If the lab technique works in the field, it could offer a new way of stopping the biting insects from spreading malaria to humans, they say.
The scientists put a new "resistance" gene into the mosquito's own DNA, using a gene editing method called Crispr.
n theory, if these mosquitoes bite people, they should not be able to pass on the parasite that causes malaria.
About 3.2bn people - almost half of the world's population - are at risk of malaria.
Bed nets, insecticides and repellents can help stop the insects biting and drugs can be given to anyone who catches the infection, but the disease still kills around 580,000 people a year.
'Pivotal role'Scientists have been searching for new ways to fight malaria.
The University of California team believe their GM mosquito could play a pivotal role - breeding resistant offspring to replace endemic, malaria-carrying mosquitoes.
They took a type of mosquito found in India - Anopheles stephensi - on which to experiment.
Dr Anthony James and his team showed that they could give the insect new DNA code to make it a poor host for the malaria parasite.
The DNA, which codes for antibodies that combat the parasite, was inherited by almost 100% of the mosquito offspring and across three generations.