Mean number ± SE of An. gambiae s.l. (panel A) and An. funestus (panel B) in different abdominal conditions (unfed, blood-fed and gravid) collected in an outdoor trap without odour (white square), baited with blend IB1 dispensed from nylon (gray square), polyester (dark gray square), cotton (black square) or cellulose + polyacrylate (brown square) material for 25 nights in Kigoche village. Mean values with different letters within the same mosquito abdominal condition differ significantly (P < 0.05).