Volume 38, Issue 2
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Selected North American mosquito species were evaluated as potential vectors of Rift Valley fever virus. Field populations of , and perorally exposed to 10–10 plaque forming units of Rift Valley fever virus readily became infected. Infection rates ranged from 51% (65/127) for to 96% (64/67) for . Disseminated infection rates were generally greater at 14 days than at 7 days after the infectious bloodmeal, and, with the exception of , they were not significantly different than the pooled rate of 59% for each species tested. Only 5/55 (9%) of the developed a disseminated infection. For most of the species, about half of the mosquitoes with a disseminated infection transmitted an infectious dose of virus to hamsters. While all species, with the exception of , transmitted virus, , and had the highest vector potential of the species tested. Following inoculation of approximately 10 plaque forming units of virus, 100% of the mosquitoes of each species became infected. For most species, transmission rates were similar for inoculated individuals and those that developed a disseminated infection following peroral infection. Viral titers of transmitting and nontransmitting-disseminated individuals were similar for all species tested. These data suggest that, if Rift Valley fever virus was introduced into North America, several mosquito species would be capable of transmitting it.


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