Volume 83, Issue 3
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



In the United States, the American dog tick, (Say) is considered an important biological vector of , the etiologic agent of tularemia. In this study, we evaluated the vector efficiency of nymphal infected as larvae with differing clades and subspecies (A1b, A2, and type B) of . In all cases, larvae were able to acquire, maintain, and transstadially transmit . Significant replication of the bacteria also occurred in infected nymphs. Transmission of to Swiss Webster mice was not observed with A1b, and low rates were observed with A2 (8.0%) and type B (13.5%). Negative effects on tick survivorship were also observed for A1b, A2, and type B infections. Our results provide evidence of a high fitness cost and low transmission rates during the immature stages, suggesting that may play a limited role in enzootic maintenance of .


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  • Received : 26 Feb 2010
  • Accepted : 12 May 2010

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