Volume 34, Issue 6
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Studies were conducted to examine the effects of extrinsic incubation (EI) temperature on the vector competence of Egyptian and North American for Rift Valley fever (RVF) virus. Following per os exposure, infection rates in remained relatively constant at 55%, 56%, and 59% for mosquitoes held at EI temperatures of 13, 26, and 33°C, respectively. In contrast, significantly fewer became infected when held at 13°C (38%), than when held at 26°C (75%) or 33°C (91%). In both species, viral dissemination and transmission occurred earlier in mosquitoes held at high temperatures as compared to those held at low temperatures. Following EI at 26 or 33°C, were able to transmit virus as early as 1 day after inoculation with RVF virus. However, 3 days were required before the first transmissions by inoculated . Temperature of EI affected these 2 species differently in their ability to transmit RVF virus. Because of the importance of EI temperature on infection and transmission rates, as well the length of the EI period, the role of EI temperature will need to be evaluated for each virus and vector pair.


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