Volume 33, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Colonized and field-collected female , infected with St. Louis encephalitis (SLE) virus by intrathoracic inoculation or by feeding on a viremic host, transmitted virus to their F adult and/or larval progeny when reared at 18(±1)°C but not when reared at 27(±1)°C. The minimal infection rates (MIR) for different populations of ranged from 1:32 to <1:250 (mean = 1:121) for larval progeny and from 1:32 to <1:1, 989 (mean = 1:1,571) for adult progeny. SLE virus also was transmitted transovarially by colonized and field-collected populations of (mean MIRs = 1:340 and 1:1,815 for larval and adult progeny, respectively) and by a field population of (MIR = 1:500 and <1:246 for larval and adult progeny, respectively), but not by colonized strains of and . SLE virus was not recovered in tests on 5,522 and 4,798 that were collected as larvae or pupae from field sites in Southern California and reared to adults at 18°C in the laboratory. Transovarial transmission of SLE virus by was confirmed and extended to a closely related species, . Efforts to demonstrate transovarial transmission of SLE virus by , and were unsuccessful. , and were equally sensitive hosts for viral isolation when inoculated with suspensions of larvae transovarially infected with SLE virus.


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