Genetic resistance to the malaria parasite gives mosquitoes feeding on infected blood a fitness advantage, researchers have found. Release of mosquitoes that are resistant to infection with malaria is one control strategy being considered to curb the disease. Marcelo Jacobs-Lorena of the Johns Hopkins University in Baltimore, Maryland, and his colleagues put 250 transgenic and 250 wild-type mosquitoes of opposite sexes into a cage, where they fed on mice infected with the Plasmodium berghei parasite.
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