Quite a few investigators, most notably Macdonald (Macdonald, 1952) have made mathematical models of malaria transmission which make an effort to correlate human infection with the prevalence of malaria an infection in mosquitoes. So set followers on the ground and switch them on to interrupt up the scent designs. https://moodjhomedia.com/story1792444/indicators-on-what-mosquitoes-carry-diseases-you-should-know