Behavioural repellency on second exposure.

<p>Proportion of female <i>Aedes aegypti</i> mosquitoes probing in response to a treatment on first exposure (treatment 1) or to a second treatment after pre-exposure to a treatment 3 hours previously (treatment 1/treatment 2). Treatments were <b>A</b>: a control arm (CA) (0.5 ml ethanol), a DEET treated arm (DA) (0.5 ml, 20% in ethanol); <b>B</b>: a hemotek heating device with nylon control (H) (0.5 ml hexane), a hemotek device with nylon spotted with DEET (HD) (0.5 ml, 20% in redistilled hexane); <b>C</b>: a section of nylon spotted with DEET with no other stimulus (D). Means are ± SEM. Means with different letters are significantly different from each other (p<0.05).