Volume 41, Issue 4
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



We exposed and to Rift Valley fever (RVF) virus in order to assess the possible role of these ticks as enzootic/epizootic RVF vectors. The virus replicated in after intracoelomic inoculation, and a minimum transmission rate of 17% was achieved after 15 days intrinsic incubation. The virus persisted at least 58 days in these ticks. Virus was also shown to pass transstadially from inoculated nymphs to adults, with peak viral titers reaching 10 plaque-forming units (PFU) in adult males after they were provided with bloodmeals. Virus was recovered from adult females 121 days after they were inoculated as nymphs. Viral titers peaked in inoculated male ticks after dropping off a host (mean titer = 10 PFU). RVF virus was not detected in pools of eggs and larval progeny from 11 infected female larvae and nymphs did not become infected after ingesting > 10 PFU while feeding on a RVF viremic hamster. The number of infected specimens declined rapidly after RVF virus was inoculated into adults, and virus was undetectable 12 days post-inoculation.


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