Volume 31, Issue 2
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Ten species of mosquitoes became sensitive to CO following intrathoracic (i.t.) inoculation of California encephalitis (CE) virus. These included field-collected and and laboratory-clonized strains of and . Another California serogroup virus, Jerry Slough (=Jamestown Canyon) (JS), also induced CO sensitivity in nearly 100% of infected female and . Sensitivity to CO developed in and within 3 days after i.t. inoculation of CE virus, remained at a high level through day 10 after inoculation and decreased gradually with time until by 30 days postinoculation nearly all mosquitoes were nonsensitive. In contrast, infected transovarially with CE virus were not CO sensitive. There was homologous but no heterologous interference to the development of CO sensitivity when infected transovarially with CE virus were inoculated with CE or JS viruses.

Two other bunyaviruses, Main Drain and Turlock, produced CO sensitivity in 3–10% and 0%, respectively, of infected and . Two togaviruses, St. Louis encephalitis and western equine encephalomyelitis, did not induce CO sensitivity in and .


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