Mosquitoes are vectors of various deadly infectious diseases, including malaria and dengue fever. Because these pathogens are transmitted by mosquito blood-feeding behavior, it is important to understand how mosquitoes are attracted to their hosts and how they feed on blood. The simplest method is to observe their behavior with the naked eye or video recording. Furthermore, various devices have been invented to assay mosquito behavior, such as olfactometers. Although each method has distinctive advantages, all have disadvantages, such as limitations in the number of individuals that can be assayed at one time and in observable durations, objective quantification methods, and others. To solve these problems, we have developed an automated device to quantify the carbon dioxide-activated heat-seeking behavior of Anopheles stephensi and Aedes aegypti with continuous monitoring for up to 1 week. This device, which is detailed in an accompanying protocol, can be applied to search for substances and molecules that affect heat-seeking behavior. It may also be applicable to other hematophagous insects.
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