Anopheles gambiae (IMAGE) Penn State Caption The researchers found that mosquitoes are most likely to transmit malaria in the early evening, when people are exposed, then at midnight, when people are protected by bed nets, or in the morning. Credit Eunho Suh, Penn State Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.