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Table 1 Vertical transmission of West Nile virus in Cx. pipiens following infection with WNV MP20 or WNV WT

From: The evolution of virulence of West Nile virus in a mosquito vector: implications for arbovirus adaptation and evolution

  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
  1. 1larvae were processed and tested in pools of 20–25.
  2. 2WNV+ pools were assumed to have a single positive individual.
  3. 3Refers to the proportion of ovipositing females vertically transmitting.
  4. 4Refers to the proportion of 3rd or 4th oviposition rafts which were WNV+.