Let me begin this article with an AP Fact Check. According to the AP (A Bill Gates-tied mosquito project is not responsible for recent US malaria cases | AP News) the cases of malaria that have recently popped up in the United States were NOT related to Bill Gates, his funding of "mosquito research" related disease prevention (Gates-Funded World Mosquito Program Engages in Gain-of-Function Research - The American Spectator | USA News and Politics), or Oxitec's (another Gates supported company) release of genetically modified mosquitoes for the past several years in Florida where the outbreaks occurred (see the previous two articles). The AP has noted that the Gates foundation does fund malaria work and GMO mosquitoes but states it's funding for Oxitec's genetically altered mosquitoes that are being released in Florida (where those mosquitoes are released) does not include any modifications related to malaria and so they could not be the cause. 

The AP really did it's homework here and also requested comment from Oxitec and noted they said it was "scientifically impossible" that they had anything to do with this coincidence. Apparently the gene editing in the Oxitec mosquitoes (that Gates has nothing to do with) is about fighting Dengue fever and Zika virus and they also only release male genetically altered mosquitoes so clearly none of this could have anything to do with the mosquitoes being worked on elsewhere that vaccinate against malaria (though these mosquitoes do exist as you can see in this story from NPR - Why mosquitoes were the vaccinators in a new malaria vaccine trial : Goats and Soda : NPR). Just in case anyone has any further doubts, the AP even talked to an entomologist at the Florida Medical Entomology Laboratory at the University of Florida and he said that the Oxitec mosquitoes "have nothing at all to do with malaria, and it's absurd to claim otherwise.