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The journal of microbiology v.50 no.2, 2012년, pp.278 - 284   SCIE SCOPUS
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Shedding of Viral Hemorrhagic Septicemia Virus (Genotype IVb) by Experimentally Infected Muskellunge (Esox masquinongy)

Kim, Robert K.    (Comparative Medicine and Integrative Biology Program, College of Veterinary Medicine, Michigan State University   ); Faisal, Mohamed    (Comparative Medicine and Integrative Biology Program, College of Veterinary Medicine, Michigan State University  );
  • 초록

    Previous experimental infection demonstrated that juvenile muskellunge (Esox masquinongy) can survive experimental infection of viral hemorrhagic septicemia virus, Genotype IVb (VHSV IVb) at a low concentration of exposure. Herein we report that survivors of experimental infection with VHSV IVb shed the virus into the surrounding environment for an extended period of time. When muskellunge were exposed to VHSV IVb by immersion at a concentration of 1,400 plaque forming units (PFU)/ml, VHSV IVb was detected in the water of surviving fish for up to 15 weeks post-exposure (p.e.) with the highest levels of shedding occurring between weeks 1 and 5 p.e. We estimated that each juvenile mu skellunge can shed upwards of $1.36{\times}10^5\;PFU/fish/h$ after initial exposure signifying the uptake and amplification of VHSV to several orders of magnitude above the original exposure concentration. Muskellunge surviving low concentration exposure were re-infected with VHSV IVb by immersion at week 22 p.e. at concentrations ranging from 0 to $10^6\;PFU/ml$ . Viral shedding was detected in all re-exposed fish, including mock rechallenged controls up to 15 consecutive weeks. Rates of viral shedding were substantially higher following rechallenge in the first 5 weeks. The highest rate of viral shedding was approximately $4.6{\times}10^6\;PFU/fish/h$ and shedding did not necessarily correspond to the re-exposure VHSV concentration. The results of this study shed new light into the dynamics of VHSV IVb shedding in a highly susceptible host and provide useful insights to fishery managers to design effective control strategies to this deadly virus.


  • 주제어

    viral hemorrhagic septicemia virus .   genotype IVb .   shedding .   muskellunge .   rhabdovirus.  

  • 참고문헌 (26)

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