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Interference to Oral Superinfection of Aedes triseriatus Infected with La Crosse Virus

Aedes triseriatus orally infected with a temperature-sensitive mutant of La Crosse virus were, at predetermined times post-infection, orally challenged with wild type La Crosse or Tahyna virus. Most mosquitoes challenged with wild type La Crosse virus within 24 hr of ingestion of the temperature-sensitive virus became superinfected. In contrast, the majority of mosquitoes challenged at 72 hr were resistant to superinfection. Mosquitoes challenged at 7 days or thereafter were refractory to superinfection with La Crosse or Tahyna virus. The onset of interference was correlated with virus titer and antigen expression in midgut cells.

Accepted for publication August 24, 1987.