Fig. 2. The noncontact repellent assay system components with blow-up (top) and assembled set-up (bottom). Study I with both ends (C) with an intact mesh screen barrier between study subject’s forearm and mosquitoes. Study II has one side with mesh screen barrier and the other chamber without a screen (not shown in illustration), exposing treated forearm to direct contact by mosquitoes. (A) Plexiglas barrier that separates assay into 2 equal-sized matched chambers, (B) exposure chamber (subdivided into 2 chambers), (C) section fitted with (or without, depending on test design) an outer screen mesh barrier.