Apparatus used to study the response of An. gambiae s.s. mosquitoes to human breath, body odours and a combination thereof. Breath was separated from body odours using a one-way breathing valve and diverted to the exhaust of the same (1) or other tent (2), or vented out through the main air exhaust (3). Alternatively, the test person sat outside the tent and his breath was diverted to one of the tent exhausts (4). a: test person, b: tent, c,d: tent exhaust, e: mosquito release cup, f: choice chamber, g: trapping chamber, h: main air exhaust. Dimensions shown are in cm. Broken arrows depict the direction of movement of air currents. Further descriptive details of the experimental set up see .