WELL, THERE’S NO DDT, SO WE HAVE TO DO SOMETHING: Even a Few Pills Can Put a Dent in the Malaria Rate. “The tactic, seasonal malaria chemoprevention, involves giving children regular doses of malaria medicine during the rainy season when mosquitoes are everywhere. The doses are too small to cure malaria, but studies by the organization in Mali and Chad showed that they reduced both simple infections and severe malaria by more than 70 percent.” I wonder if this will promote resistance.