Table 1.

Vertical transmission of West Nile virus in Cx. pipiens following infection with WNV MP20 or WNV WT

	WNV MP20	WNV WT
total larvae tested1	2772	2410
WNV+ pools	2	5
infection rate/10002	0.72	2.08
WNV + rafts/total (%)	1/51 (1.96)	4/47 (8.51)
adults VT/ ovipositing (%)3	1/39 (2.56)	3/30 (10.0)
WNV+ OV 3–4 rafts/total4	1/1	4/4

¹larvae were processed and tested in pools of 20–25.

²WNV+ pools were assumed to have a single positive individual.

³Refers to the proportion of ovipositing females vertically transmitting.

⁴Refers to the proportion of 3^rd or 4^th oviposition rafts which were WNV+.