Scientists in the US have created a genetically engineered strain of malaria-resistant mosquito that is better able to survive under certain conditions than normal mosquitoes.

They say that if this transgenic mosquito could dominate in the wild, it could prevent humans being infected with malaria.

Each year the disease makes 300 million people ill and causes one million deaths around the world, with 90% of cases in sub-Saharan Africa.

The breakthrough was made by researchers at Johns Hopkins University in Baltimore, Maryland.