(FILES) This 15 November 2006 file photo shows a mosquito. US researchers have created genetically-modified mosquitoes resistant to a malaria parasite, raising the possibility of one day stopping the spread of the disease, a new study says.The genetically-engineered mosquitoes outbred natural mosquitoes when fed malaria-infected blood from mice, according to the study published 19 March, 2007 in the Proceedings of the National Academy of Sciences. AFP PHOTO/FILES/ CHRISTIAN PUYGRENIER