Volume 48, Issue 6
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Experiments were conducted to determine whether West Nile (WN) virus was transmitted vertically by colonized strains of , and . Female mosquitoes were infected by intrathoracic inoculation with WN virus, and the F progeny were tested for virus by the fluorescence antibody technique and the newborn mouse assay. Each of the three mosquito species transmitted WN virus to F adults derived from immature forms reared at 26°C. The minimal filial infection rate (MFIR) ranged from 1:124 to 1:138 for , from 1:62 to 1:172 for , and from 1:325 to 1:859 for . The MFIR for reared at 20°C was 1:213 for larvae and 1:390 for pupae, and 1:208 for larvae and 1:554 for pupae reared at 26°C. These data are the first reported evidence of vertical transmission of WN virus by mosquitoes, and therefore warrant further studies to determine whether vertical transmission occurs among WN viral-infected mosquitoes in nature.


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