Fig. 2

World Health Organization (WHO) cone bioassays exposure equipment. Treated or untreated mesh net sections secured between 10 cm by 30 cm white translucent plastic board (Challoner Marketing Ltd, Amersham, UK) and two WHO bioassay cones (Vector Control Research Unit, UniversitiSains Malaysia, Malaysia) into which twenty-five three to four day-old non-bloodfed female C. nubeculosus were introduced per bioassay cone for a three minute exposure period