Table 1.

Numbers of female Aedes aegypti locating the source of carbon dioxide (CO₂) or odour from human foot within 3 min. in the wind tunnel in experiments 1a (odours plumes superimposed, CO₂ downwind of foot odour), 1b (odours plumes superimposed, foot odour downwind of CO₂), and 2 (odour sources equidistant and plumes distinct).

Experiment	Treatment	n	CO2	Foot odour	P < 0.05
1a	CO2 alone	28	24	-	a
	Foot odour alone	23	-	17	b
	CO2 + foot odour	27	3*	21	b
1b	CO2 alone	27	21	-	a
	Foot odour alone	26	-	19	b
	CO2 + foot odour	27	0	22	b
2	CO2 alone	27	21	-	a
	Foot odour alone	21	-	16	b
	CO2 + foot odour	27	0	22	b

Different letters in the column to the right identify significant differences in numbers locating the CO₂ source (CO₂ location between all treatments in experiments 1 & 2 were compared pair-wise, Fisher's exact test P < 0.05).

^*The 3 females responding to CO₂ located the source and then immediately navigated to and landed on beads with foot odour. n = number of females (out of 30) released that flew upwind.